Series editors' preface - Wood Tools

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Plastics and polymers, coatings and binding media, adhesives and consolidants 129 designation of the first synthetic plastic is rather arbitrary. However, this distinction is often given to the cellulose nitrates. In 1846 an explosive known as gun-cotton was made by reacting a mixture of nitric and sulfuric acids with cotton-wool. Experiments on this material showed it to be thermoplastic, but highly unstable and flammable. The extensive efforts of Alexander Parkes in England led eventually to a thermoplastic resin composed of less highly nitrated cellulose combined with various oils, fillers and pigments, and called Parkesine. Moulded objects were made from this material between 1855 and 1868 but suffered from fragility. In 1869, the Hyatt brothers of Albany, New York patented a synthetic ivory named Celluloid made from cellulose nitrate plasticized with camphor which was an immediate and lasting success. The manufacturing technologies developed to convert Celluloid and its English equivalent Xylonite into a wide range of useful and decorative objects formed the basis of a plastics industry which grew and flourished as further discoveries were made. A thermosetting, crosslinked resin synthesized from phenol and formaldehyde was patented by Leo Baekeland in 1907 as Bakelite. Bakelite could be produced in any colour (that allowed for its natural yellow tint), was very hard and rigid and found extensive use in early radio cabinets, automobile components and other high-tech applications. In 1922, a great impetus was given to the synthesis of further plastic compounds by the work of Hermann Staudinger. In the process of synthesizing rubber, Staudinger identified and described the essential linear structure of polymers. A more sophisticated understanding of polymer structure gave rise after 1930 to a rapidly growing list of ‘plastics’ arrived at by deliberate chemical engineering rather than trial-and-error or chance discovery. After the Second World War, furniture made entirely of plastics became increasingly popular (e.g. see Katz, 1984). Clear acrylic sheet (Perspex ® , Plexiglas ® ) made from poly (methyl methacrylate) was extensively employed but was soon found to be brittle and easily scratched. A summary of the main synthetic polymer materials is given in Table 4.1. Perhaps the category of plastics most important to furniture history and manufacture are the composites or laminates. Composites are com- binations of dissimilar materials that show properties different from and often superior to the individual ingredients (Gordon, 1976). This is a very old concept and in many ways describes all of the materials discussed so far in that they are almost never pure substances. An early example of structural composites showing high strength combined with low weight were the papier mâché panels used to form furniture (see section 5.4). Gypsum plaster and coarse weave jute or hemp layered into moulds or built up on wooden armatures were extensively employed for the realization of complex architectural interiors and even entire exhibition buildings. Such ‘fibrous plaster’ or ‘staff’ filled the functions of what is today commonly called ‘fibre-glass’. Fibre-glass is a rather misleading term for resin and glass-fibre composites more properly called glass reinforced plastics or GRPs. Such composites use glass fibre in the form of cord, cloth or randomly oriented felt-like matt which is impregnated with thermosetting resins such as phenolics, epoxies and polyesters. They are very strong, relatively light in weight and have been used to manufacture furniture since the 1940s. Paper-based composite laminates have also found extensive use in furniture as surface coverings. Laminates such as Formica ® , based on paper and melamine resin, have been used to copy every variety of wood and stone. Synthetic polymers had a revolutionary effect on the textile industries and synthetic fibres were quickly brought into use in upholstery. Uses of polymers in upholstery are described in Chapter 3. Polymer foams can be thought of as composites of resins and gas bubbles. They can be made either soft and flexible or hard and rigid depending on resin composition and bubble size. An extremely readable review of the technology of fibres, plastics and rubbers is given by Kaufman (1968). Kovaly (1970), Buttrey (1976) and Seymour and Mark (1990) provide further information on the utilization of plastics in furniture and as industrial finishes. Polymers that become soft or fluid when heated have had various applications in moulding and casting. Historically they have been used to produce rigid moulds. Decorative plasterers have used mixtures of waxes, resins and fillers to produce moulds for repeat pat-
130 Conservation of Furniture Table 4.1 Review of some important synthetic polymers Polymer group, names Date Description and use Simple identification and trademarks introduced and country Acrylic Poly(methyl methacrylate) (PMMA) Oroglas (Röhm & Haas – USA), Perspex (ICI – GB), Plexiglas (Röhm GmbH-D) Acrylonitrile-butadiene rubber (NBR) Nitrile rubber Acrylonitrile-butadienestyrene (ABS) Butyl rubber (BUTYL) Cellulose acetate butyrate (CAB) Uvex (Eastman Chemical Products Co., USA) Cellulosic esters cellulose nitrate (CN) cellulose acetate (CA) Epoxy (EP) PMMA: 1934 UK 1952 USA CN: 1870 USA CA: 1905 Germany 1947 USA Amorphous, thermoplastic, carbon chain addition polymer. PMMA is usually produced by ‘casting’ from monomer to form clear or opaque coloured sheets or rods with good outdoor durability. Brittle unless toughened but cuts cleanly. Used as ‘unbreakable’ substitute for glass, for mouldings and light fittings. Various acrylics used as adhesives and as solution/dispersion type coatings. Widely used in conservation as consolidants and coatings Rubber formed by emulsion polymerization of acrylonitrile and butadiene. Used for oil resistant properties Amorphous thermoplastic mixture of styrene with acrylonitrile and nitrile rubber. Chemical resistant and tough with generally good impact resistance though toughness somewhat variable. Normally in opaque colours. Can be formed, moulded, extruded and calendared. Cuts cleanly Formed by ionic polymerization of isobutylene with a small proportion of isoprene. Mainly used in inner tubes for tyres. Also used as adhesive Thermoplastics formed by chemical modification of the natural polymer, cellulose, present in cotton and wood. Used with a plasticizer. CA: Moderately tough (notch brittle) with good impact resistance but poor outdoor durability. Films used in photography and for packaging are highly transparent and protective but tear easily. Found in textile fibres as cellulose acetate and triacetate. Some use as adhesive. CN used in solution type coatings Thermoplastic. Similar to cellulose acetate but with improved outdoor durability. May develop smell of rancid butter on ageing. Cuts cleanly. Also used in simple solution coatings Amorphous, thermosetting network polymer. Basic functional unit formed by reaction of epichlorhydrin with diphenylol propane can be polymerized in situ with a variety of crosslinking agents, the main ones being amines. Used for surface coatings and adhesives and some mouldings Burns noisily with blue-based yellow flame, little smoke, acrid fruity smell. Continues to burn after removal from flame. Not affected by cyclohexanone or by aromatic solvents Burns with blue-based yellow flame and black smoke with faint odour of marigolds. Continues to burn after removal from flame. Softened by cyclohexane but not by aromatic hydrocarbon solvents CA: Burns rapidly with bluebased orange flame and smell of burning paper. Sputters and drips while burning. Continues to burn after removal from flame. Softened by cyclohexane but not aromatic hydrocarbons Burns with yellow flame and smell of rancid butter. Continues to burn after removal from flame. Softened by cyclohexane but not by aromatic hydrocarbons
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Conservation of Furniture
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Conservation of Furniture Shayne Ri
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Contents Series editors’ preface
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3.2.5 Coated fabrics and ‘leather
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The actual move 275 Protection of o
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Recording and reporting treatment 4
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11.5.6 Enzymes 548 11.5.7 Blanching
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15.3.5 Repairs 683 15.3.6 Replaceme
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16.9.2 General care 771 16.9.3 Clea
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Series editors’ preface The conse
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Contributors Part 1 History 1 Furni
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Brenda Keneghan Senior Conservation
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Acknowledgements It would take a ve
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Illustration acknowledgements The a
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Figure 4.14 (a,c,d) Drawing by Liz
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Figure 11.9 Julie Arslano˘glu base
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Figure 15.17 Courtesy of P.R. Jacks
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Part 1 History
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1 Furniture history 1.1 Introductio
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Figure 1.2 Klismos chair, English,
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Figure 1.3 Late medieval oak Englis
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conjunction of polychromy and carvi
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Materials used The choice of materi
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period reflects the dour and simple
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Figure 1.10 High-backed cane chair,
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to use the continental dovetailing
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Figure 1.14 Japanned cabinet on sta
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furniture by contrast was generally
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Figure 1.16 A mahogany English Rege
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One process of construction that co
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eforms in education (1870 Elementar
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chesterfields, chiffoniers, davenpo
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Figure 1.20 Papier mâché chair, E
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Figure 1.21 Thonet bentwood chair,
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major feature, and confirmed the se
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Figure 1.25 Sideboard, ‘Casablanc
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Figure 1.27 Tulip chair, designed b
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The range of finishes has increased
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Viaux, J. (1962) Le Meuble en Franc
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Specific texts relating to trade or
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Part 2 Materials
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2 Wood and wooden structures It is
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many properties, such as increasing
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ant consideration in the selection
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2.2.2 Wood anatomy: softwoods The c
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may be gradual in some woods, abrup
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PARENCHYMA ARRANGEMENTS V P Apotrac
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the United States. In the UK, the T
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Ash - Fraxinus spp. (1) F. american
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Birch - Betula spp. (1) B. alleghan
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Rosewood - Dalbergia spp. D latifol
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A A northern red oak Quercus rubra
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Figure 2.9 Tangential microscopic v
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In the walnut genus, Juglans, two i
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Figure 2.12 A representative portio
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depending upon species, whether sap
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Page 116 and 117: Equilibrium moisture content (%) 28
Page 118 and 119: mechanical effects of repeated shri
Page 120 and 121: wood member, for example, a block o
Page 122 and 123: The strength of wood in compression
Page 124 and 125: er of defects and repairs, and the
Page 126 and 127: unwanted movement in the joint is r
Page 128 and 129: 2.7.5 Other joint types Among other
Page 130 and 131: Figure 2.30 Dovetails and associate
Page 132 and 133: 3 Upholstery materials and structur
Page 134 and 135: Figure 3.1 A late sixteenth century
Page 136 and 137: Epidermis/ skin Hair shaft Sweat gl
Page 138 and 139: it over a blunt metal blade or by p
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Page 142 and 143: Rattan or cane The cane that is use
Page 144 and 145: wood pulp and cellulose acetate fro
Page 146 and 147: The surfaces of both woven and non-
Page 148 and 149: (Gill and Eastop, 2001). ‘Throwaw
Page 150 and 151: was not until the early nineteenth
Page 152 and 153: (a) (b) (c) Horse hair, obtained fr
Page 154 and 155: The ability of elastomers to be mou
Page 156 and 157: include polysaccharide gums such as
Page 158 and 159: Shearer, G.L. (1989) An Evaluation
Page 160 and 161: Plastics and polymers, coatings and
Page 166 and 167: Melamine formaldehyde (MF) Phenol f
Page 168 and 169: Polyurethanes (PUR) Poly(vinyl acet
Page 200 and 201: CH 2—OOCR l R ll COO—CH O CH
Page 204 and 205: (c) 4.7.4 Proteins Plastics and pol
Page 212 and 213: Triterpenoids Plastics and polymers
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Plastics and polymers, coatings and
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Figure 5.2 Sources of ivory that ha
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(a) (b) Bone and antler Bone has be
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Table 5.1 Class characteristics of
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In walrus ivory an outer primary de
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(a) (b) imitate the more costly tur
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Figure 5.12 Mollusc shells used in
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tive applications. Metal tools have
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e preferred by hand smiths until it
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Table 5.2 Relationship between comp
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observed features can be carried ou
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Figure 5.14 The use of a crane to m
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Early in the fourteenth century sma
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diffraction, energy dispersive X-ra
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a substance exists as a hybrid of t
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Table 5.3 Pigments Other materials
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Table 5.3 Pigments - continued Othe
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Table 5.3 Pigments - continued Othe
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Table 5.3 Pigments - continued will
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Table 5.4 Some traditional colorant
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parent to X-rays. X-ray diffraction
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Larsen, E.B. (1984) Electrotyping,
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Van Duin, P. (1989) Two pairs of Bo
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Part 3 Deterioration
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6 General review of environment and
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which water, oxygen and other react
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standard free energies of starting
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protect the material. When these be
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Table 6.1 UV Component of various l
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through which daylight is highly di
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climate. An important aspect of the
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(a) 60 (b) 30 55 30 50 45 25 40 35
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panying fungal attack. Animal fibre
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allowed to expand in one part of th
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paint, silk and some dyes and pigme
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ences listed at the end of the foll
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about by localized conditions such
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about the same size as the width of
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ing for some time before they are n
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may cause irreparable damage. Appli
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ensure that the chance of further i
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plied by the density of the materia
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6.2.8 Environmental management for
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est changed at the same intervals.
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in locations familiar to all to sav
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Appelbaum, B. (1992) Guide to Envir
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7 Deterioration of wood and wooden
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(a) Figure 7.1 A knot is a portion
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figure or behaviour. Tangential (fl
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time of exposure, moisture content
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RH changes lead to changes in moist
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Equilibrium Moisture Content (EMC)
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(a) (b) Figure 7.6 The common furni
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one has proof of active infestation
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including starch depletion of timbe
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ise, when making wooden structures,
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(a) (b) (a) (b) Faults in execution
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Figure 7.14 Rear door of a boulle b
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Relative humidity (%) 100 90 80 70
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woodworm damage is accompanied by s
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century. In between these examples
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8 Deterioration of other materials
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(Tennent and Baird, 1985). Coatings
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Table 8.2 Copper corrosion products
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Table 8.5 Galvanic series in seawat
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occur either as a result of the des
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colour of a decorative paint surfac
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traditional furniture materials. Po
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preferentially absorb energy at wav
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may not be directly proportional to
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Figure 8.4 Detail of a pine panel f
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Figure 8.6 Detail of the lower part
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(a) (b) to changes in the medium us
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which property changes become appar
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ond with the support. Uneven drying
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the structure of the lacquer film a
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8.10 Adhesives In practice, adhesiv
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~CH 2—CH—CH 2~ | O Alkoxy radic
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within the leather leads to a react
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crease at corners of upholstery, or
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eaves of buildings are a source fro
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inter-chain interactions are the ma
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(a) (b) Figure 8.13 Degradation of
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trims to the frame may render fibre
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Wessell (eds), Deterioration of Mat
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Shashoua, Y. (1996) A passive appro
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Part 4 Conservation
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9 Conservation preliminaries This c
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techniques and rigorous grounding i
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• The retention of as much origin
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(a) (b) (c) (d) (e) Conservation pr
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and preservation. He proposed a mod
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cally be undertaken. Before embarki
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cal, solutions include enclosing th
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various materials that make up the
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the nature, extent, severity and lo
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treatment needs. Reliable identific
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Figure 9.2 A good quality loupe (ri
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information should always be carefu
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ange immediately upon excitation. T
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when dyes are being used to achieve
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cause inaccurate readings. Wood tha
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structure of elements that have bee
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(a) ‘reading’ of the object. Fo
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design. This can be specially commi
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candle 1900 K Household electric li
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fessional quality shots in conserva
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• Availability of adaptors for cl
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Recording and reporting treatment O
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should also be provided in or close
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it is possible to share some facili
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Solvent storage Solvents should be
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(a) (b) and condition of incoming a
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Wherever possible, manual handling
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some specific details of that proce
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outes of entry to the body; risk ph
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(a) (b) Figure 9.11 Examples of app
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isks so that harm is unlikely? Only
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general maintenance of the workshop
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and other emergencies such as gas l
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Dunbar, M. (1989) Restoring, Tuning
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Stevens, R.E. (1980) Microscopical
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example, extensive treatment on one
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of the stock and a rule of thumb fo
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(a) (b) Chair leg False tenon 1/3 a
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(a) (b) (c) Figure 10.3 Testing the
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Hammer veneering with animal/hide g
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(a) (b) Principles of conserving an
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Table 10.2 Cramping/clamping device
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Table 10.3 Abrasives Principles of
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Table 10.3 Abrasives - continued ne
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measure the diagonals across the se
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(i) (ii) (a) Figure 10.11 Dismantli
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10.2.4 Reinforcing joints If a loos
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microballoons. They may be levelled
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Figure 10.15 Jig used to keep fills
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as a gap filler in cases where a fa
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should be critically evaluated befo
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(a) (b) Figure 10.21 Marking out do
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to the substrate or by using paper
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e progressively tightened over the
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Boucher (1995) described a techniqu
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(a) (b) (c) Figure 10.23 Repairing
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ducing the curves on boulle and mar
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similar fabric is stretched across
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ures involved in preparing a copy o
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and capture a high degree of detail
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materials, used extensively by scul
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making material. Traditional releas
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The compo can be rolled out into a
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Properties, Chemistry and Preservat
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ehaviour of twentieth and twenty-fi
Page 532 and 533:
(a) (b) (c) cleaned area should be
Page 534 and 535:
Cleaning tests may embrace a wide r
Page 536 and 537:
11.2 Mechanical cleaning Mechanical
Page 538 and 539:
When a scalpel is used to pick away
Page 540 and 541:
adhere the unwanted varnish or dirt
Page 542 and 543:
USA solvents (also known as) TLV (A
Page 544 and 545:
alent to low aromatic (c.17-20% aro
Page 546 and 547:
R' | R - C O The presence of the c
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suppliers. Careful selection of sol
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agency within the Department of Lab
Page 552 and 553:
There are four stages in the dissol
Page 554 and 555:
Figure 11.10 The positions of some
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Table 11.2 Teas’ solvent referenc
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ethanol acetone white spirit Figure
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as odourless mineral spirits or whi
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effective in breaking down coatings
Page 564 and 565:
11.4.3 Acids Organic acids have the
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keep the contact time of both clean
Page 568 and 569:
The two primary factors in choosing
Page 570 and 571:
Detergents Commercially viable synt
Page 572 and 573:
(a) (b) Figure 11.19 Orientation of
Page 574 and 575:
carbon rinse is required (Burnstock
Page 576 and 577:
Table 11.8 Properties of some deter
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constant (k) (at standard temperatu
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Conditional stability constant (log
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solution and act as a buffer, e.g.
Page 584 and 585:
Figure 11.24 Old residues of a coll
Page 586 and 587:
General purpose protease gel 100 ml
Page 588 and 589:
Wax pastes have traditionally been
Page 590 and 591:
on the application. It has been sug
Page 592 and 593:
As with gels formulated from cellul
Page 594 and 595:
Leonard, M., Whitten, J., Gamblin,
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Viscosity may be manipulated to mee
Page 598 and 599:
12.2.2 Penetration of consolidant a
Page 600 and 601:
Natural materials Wax has been used
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tive. Volatile ‘binding’ media
Page 604 and 605:
that influences the choice of gelat
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malachite and azurite. Decorative s
Page 608 and 609:
of flakes and cups but care should
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damage when levelling the fill and
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erty of the adhesive polymer rather
Page 614 and 615:
dimensional forms such as curved co
Page 616 and 617:
(a) (b) (c) (d) Principles of c
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chemical stability, flexibility and
Page 620 and 621:
colours are ideal for under-saturat
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and those that must withstand use.
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efractive index for air is 1.003 (B
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use whenever possible and many cons
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tic, dammar and MS2A. Window glass
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although slower evaporating solvent
Page 632 and 633:
ut insoluble in acetone and lower a
Page 634 and 635:
Figure 12.13 Diagrammatic represent
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(a) (b) ‘touch-up’ guns may be
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appearance of paintings, Studies in
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American Chemical Society, Washingt
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often rely on self-levelling spray
Page 644 and 645:
ecoming progressively harder and da
Page 646 and 647:
Identifying a historical progressio
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normally seen, so that it can be mo
Page 650 and 651:
Figure 13.4 Parafilm ® is a thin w
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of an overall finishing strategy. I
Page 654 and 655:
e used cautiously and with suitable
Page 656 and 657:
(a) (b) (c) Figure 13.6 The use of
Page 658 and 659:
Figure 13.7 Proprietary shellac sti
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Thus conservation grade materials m
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ing the colour. This may be useful
Page 664 and 665:
materials is their photochemical st
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(a) (b) Figure 13.11 Use of oils (a
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French polishing French polishing d
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during a polishing session. If the
Page 672 and 673:
applying fresh polish before pullin
Page 674 and 675:
the addition of a separate thixotro
Page 676 and 677:
Roelop, W. (1994) Coloured mordants
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eflective shine, whilst oil gilding
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is used for laying gold and silver
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wood be dry, free of grime, oil and
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necessary to use a size coat as str
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however, makes it more difficult to
Page 688 and 689:
flutes or other details in the carv
Page 690 and 691:
14.2.12 Yellow ochre A coat of size
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applied only to highlight areas (Fi
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Figure 14.12 Manipulating the gold
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14.2.17 Double gilding Water gildin
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ground would be prepared uniformly
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areas, however deep, that have been
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15 Conserving other materials I Thi
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Consolidation Powdering or flaking
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synthetic materials, such as Paralo
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shell or horn itself may be dyed wi
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oration and brittleness. The cellul
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to reverse if necessary. Gelatin ma
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emoval. Dusting or wiping over the
Page 716 and 717:
Figure 15.4 Reverse side of a music
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of electrolytes (e.g. after removin
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gases, vapours, liquids and ions. T
Page 722 and 723:
when the object is handled. Researc
Page 724 and 725:
and graphite. They were commonly us
Page 726 and 727:
(a) (c) so if the treatment is to a
Page 728 and 729:
into consideration the importance a
Page 730 and 731:
Alkaline glycerol solution will rem
Page 732 and 733:
Figure 15.11 A gold snuff box, c.18
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(1990) and CCI notes 9/7 (1993). Th
Page 736 and 737:
into the workplace. The type of exp
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(a) (b) Figure 15.14 Use of pressur
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ensure that any water residues are
Page 742 and 743:
The materials used in the decoratio
Page 744 and 745:
solvent creeping behind or undernea
Page 746 and 747:
Snow, C.E. and Weisser, T.D. (1984)
Page 748 and 749:
Koob, S.P. (1986) The use of Paralo
Page 750 and 751:
coatings that may have been applied
Page 752 and 753:
acrylic paint may be used if it is
Page 754 and 755:
16.2 Plastics 16.2.1 Introduction t
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PVAC, Paraloid B72, ethylene vinyl
Page 758 and 759:
dyed by contract. Although this may
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Textiles used in upholstery conserv
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springs, iron tacks, or brass naili
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Reapplication of lined textiles Sta
Page 766 and 767:
16.4 Leather, parchment and shagree
Page 768 and 769:
minium triformate or aluminium alko
Page 770 and 771:
(1991) reported that stronger bonds
Page 772 and 773:
y enzymatic or lime action and whic
Page 774 and 775:
The principles outlined above for s
Page 776 and 777:
Figure 16.12 Front rail of a ninete
Page 778 and 779:
may be appropriate for leather lini
Page 780 and 781:
If the surface is unaffected by spo
Page 782 and 783:
cation and characterization of the
Page 784 and 785:
may not be representative of the ki
Page 786 and 787:
Deoxycholate soap recipe 2 g deoxyc
Page 788 and 789:
that which occurs during the remova
Page 790 and 791:
(a) (b) (c) (d) 16.7.3 Cleaning [1]
Page 792 and 793:
In the past, abrasives such as rott
Page 794 and 795:
Wax has been used many times to inf
Page 796 and 797:
permanently etch the lacquer, leavi
Page 798 and 799:
etouching and coating of lacquer ob
Page 800 and 801:
(a) (b) Figure 16.23 Japanese inro
Page 802 and 803:
Extended exposure to polar solvents
Page 804 and 805:
Retouching may involve reproducing
Page 806 and 807:
ethical considerations. Objects tha
Page 808 and 809:
tion will need to be reduced accord
Page 810 and 811:
(a) (b) Figure 16.28 Filling with a
Page 812 and 813:
to worked through the gold leaf slo
Page 814 and 815:
Down, J.L., MacDonald, M.A., Willia
Page 816 and 817:
Rococo Lacquers, Arbeitshefte des B
Page 818 and 819:
Budden, S. (ed.) (1991) Gilding and
Page 820 and 821:
Index Aalto, Alvar, 36, 38 Abalone
Page 822 and 823:
Cabinetscraper, 449 Cabriole leg, 2
Page 824 and 825:
Comparison, 385 Composites, 129 Com
Page 826 and 827:
Electromotive force (EMF) series, 3
Page 828 and 829:
deterioration, 333-5 gesso grounds,
Page 830 and 831:
textiles, 351 wood, 290-1 for photo
Page 832 and 833:
extenders, 145 identification, 187,
Page 834 and 835:
plastics, 721 See also Coatings Rev
Page 836 and 837:
Textiles, 107-12, 120 conservation,
Page 838 and 839:
epair material selection, 437-9 woo
Page 840 and 841:
(a) (c) Plate 1 Detail of leather u
Page 842 and 843:
Plate 3 Side table (c.1775) designe
Page 844 and 845:
(a) (b) Plate 6 A tall case japanne
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