Series editors' preface - Wood Tools

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Plastics and polymers, coatings and binding media, adhesives and consolidants 175 secretions of a scale insect Laccifer lacca which infests a variety of host trees in certain regions of Southern Asia. In India the principal host is Butea monosperma. The raw lac product consists of resin encrusted sticks and twigs (hence stick lac) intermixed with insect remains, dyestuff and other unwanted contaminants. The first stage of refining traditionally involved crushing this raw material, sieving off the larger sticks and twigs and washing in water to remove the dye. The dye was valued for colouring leather and imparting a beautiful red to silk and was precipitated from solution by the addition of lime. When dry, the resin was winnowed to remove small fragments of stick. This produced the semi-refined seed-lac which had a grain like appearance and varied in colour from yellow to reddish brown depending on the district in which it was cultivated and the type of tree from which it was derived. Further purification involved heating long sausage shaped bags about two inches in diameter filled with seed lac and gently squeezing the molten shellac through the cloth. It was then stretched into a thin sheet. The thinner central portion of the sheet was broken up into shellac flakes while the thicker edges were mixed with the subsequent batch. The indigenous use of shellac buttons for applying a decorative glaze by friction heating was assisted by the addition of other natural resins particularly cheap and brittle rosin. A small quantity of orpiment could also be added to lighten the appearance of both flakes and varnish and this made it slightly opaque. These adulterations were likely to have been undertaken before the shellac was exported but it is also entirely conceivable that unscrupulous importers or retailers could have further adulterated their supplies. At any rate shellac as such was shunned in favour of seed lac by Stalker and Parker and their contemporaries. The chemistry of shellac is extremely complex and only recently understood. Raw lac contains 70–80% resin, 6–7% wax, 4–8% coloured matter and some moisture. The resin fraction divides into a hard (ether-insoluble) fraction and a soft (ether-soluble) fraction. Shellac resin consists largely of low molecular weight polymers (oligomers) formed by esterification of polyhydroxy carboxylic acids with one another. It is possible by rigorous purification under laboratory conditions to obtain a material that has been designated ‘pure lac resin’. This is a fairly low molecular weight (2100) polyester formed by reaction of aleuritic acid and a sesquiterpene acid. In this esterification reaction, aleuritic acid, an aliphatic polycarboxylic acid related to the common fatty acids, functions as the acid and sesquiterpene acid functions as the alcohol. It appears that the hard and soft resin fractions are essentially similar but differ in the number of polymer units (oligomers) present in the molecule. Shellac also contains aldehyde groups which may be gradually converted by oxidation to carboxylic acid groups. As there are plenty of hydroxyl groups available in the molecular structure of shellac, it is possible that the esterification process could continue in a shellac film and that this could explain the gradual reduction in alcohol solubility of shellac that occurs over time. Historically, shellac has been used both alone and in combination with other resins. An early reference documenting the use of shellac by itself is in the hand written notes of tradesman Isaac Byington from Bristol, Connecticut (Byington, 1795). It is produced in various forms and grades as buttons, pellets, and flakes, seedlac, garnet lac, orange, blonde and white. These are all essentially soluble in ethanol or blends of alcohols being usually made in about a 25% solution (roughly a 2 pound cut). The less refined shellacs have a fairly dark hue while the most thoroughly processed, blonde, is quite clear. Commercially available white shellac is bleached through a chlorination process resulting in a less stable material both before and after its use (Flexner, 1994). Copestake (1992) has shown that decoloration using activated charcoal results in a much more stable product. Shellac is important in furniture conservation where it is often used for finishing new wood that is being matched to an old surface. It has several qualities which make it particularly useful in conservation. It has desirable colour and refractive qualities for wood substrates, is consistent with the visual qualities of traditional coatings, and can saturate and adhere well to them. It is relatively easy to formulate and use, has a short drying time, is resistant to abrasion and chipping and can easily be redissolved in alcohols. Although shellac does change chemically over time, practical experience suggests
176 Conservation of Furniture Table 4.3 Summary of principal natural resins Class Family/ Genus and species Common name Notes (subfamily) (spp. = various species) Monoterpenoid Diterpenoid (Pinaceae) Labiatae Lauraceae Coniferae (Pinaceae) Coniferae (Cupressaceae) Pinus spp. Lavandula spica Rosmarinus officinalis Cinnamomum camphorae Pinus spp. Picea spp. Abies spp. Larix spp. especially L. decidua Pseudotsuga menziessii (Douglas fir) Tetraclinis articulata Oil of turpentine Oil of spike (spike lavender) Oil of rosemary Camphor Common or Bordeaux turpentine, rosin or colophony Burgundy pitch Strasbourg turpentine; Canada balsam Venice turpentine Oregon balsam Sandarac A mixture of monoterpenes of variable composition obtained by distillation of crude pine resin (gum turpentine) or pine stumps (wood turpentine). Oxygenated/polymerized materials may remain and may cause yellowing when turpentine is used as a solvent. Known since the sixteenth century Complex mixture of monoterpenes and some sesquiterpenes. Includes oxygenated components. Less volatile than oil of turpentine. In use from the sixteenth century Used as a plasticizer Pine resins are the most important of the Pinaceae resins. Mainly soft, soluble, unpolymerized resins or balsams. Abundant and cheap. Composition variable and inconstant with principally acid components. Colophony or rosin, the harder involatile component remaining after distillation of crude pine resin has melting point of 100–130 °C and good solubility in turpentine and aromatic hydrocarbons Canada balsam used as a mounting medium in microscopy Used as a varnish as such, as a modifier for other resin varnish compositions, and as raw material for preparation of copper resinate ‘pigment’. Dries slowly to yellow, brittle film. Due to high cost not regularly used for preparation of oil of turpentine Cupressaceae resins contain polycommunic acid, an important component of fossil resins, that gives rise to polar materials such as
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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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0 and 25% moisture content. They ha
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Equilibrium moisture content (%) 28
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mechanical effects of repeated shri
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wood member, for example, a block o
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The strength of wood in compression
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er of defects and repairs, and the
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unwanted movement in the joint is r
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2.7.5 Other joint types Among other
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Figure 2.30 Dovetails and associate
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3 Upholstery materials and structur
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Figure 3.1 A late sixteenth century
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Epidermis/ skin Hair shaft Sweat gl
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it over a blunt metal blade or by p
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and dried to remove unwanted flesh
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Rattan or cane The cane that is use
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wood pulp and cellulose acetate fro
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The surfaces of both woven and non-
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(Gill and Eastop, 2001). ‘Throwaw
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was not until the early nineteenth
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(a) (b) (c) Horse hair, obtained fr
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The ability of elastomers to be mou
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include polysaccharide gums such as
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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
Page 230 and 231: Figure 5.2 Sources of ivory that ha
Page 232 and 233: (a) (b) Bone and antler Bone has be
Page 234 and 235: Table 5.1 Class characteristics of
Page 236 and 237: In walrus ivory an outer primary de
Page 238 and 239: (a) (b) imitate the more costly tur
Page 240 and 241: Figure 5.12 Mollusc shells used in
Page 242 and 243: tive applications. Metal tools have
Page 244 and 245: e preferred by hand smiths until it
Page 246 and 247: Table 5.2 Relationship between comp
Page 248 and 249: observed features can be carried ou
Page 250 and 251: Figure 5.14 The use of a crane to m
Page 252 and 253: Early in the fourteenth century sma
Page 254 and 255: diffraction, energy dispersive X-ra
Page 256 and 257: a substance exists as a hybrid of t
Page 258 and 259: 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
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(a) (b) (c) cleaned area should be
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Cleaning tests may embrace a wide r
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11.2 Mechanical cleaning Mechanical
Page 538 and 539:
When a scalpel is used to pick away
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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
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There are four stages in the dissol
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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
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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
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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
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General purpose protease gel 100 ml
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Wax pastes have traditionally been
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on the application. It has been sug
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As with gels formulated from cellul
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Leonard, M., Whitten, J., Gamblin,
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Viscosity may be manipulated to mee
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12.2.2 Penetration of consolidant a
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Natural materials Wax has been used
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tive. Volatile ‘binding’ media
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that influences the choice of gelat
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malachite and azurite. Decorative s
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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
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dimensional forms such as curved co
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(a) (b) (c) (d) Principles of c
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chemical stability, flexibility and
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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
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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
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ecoming progressively harder and da
Page 646 and 647:
Identifying a historical progressio
Page 648 and 649:
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
Page 666 and 667:
(a) (b) Figure 13.11 Use of oils (a
Page 668 and 669:
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
Page 680 and 681:
is used for laying gold and silver
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wood be dry, free of grime, oil and
Page 684 and 685:
necessary to use a size coat as str
Page 686 and 687:
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
Page 694 and 695:
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
Page 702 and 703:
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
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when the object is handled. Researc
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and graphite. They were commonly us
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(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
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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
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coatings that may have been applied
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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
Page 760 and 761:
Textiles used in upholstery conserv
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springs, iron tacks, or brass naili
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Reapplication of lined textiles Sta
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16.4 Leather, parchment and shagree
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minium triformate or aluminium alko
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(1991) reported that stronger bonds
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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
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If the surface is unaffected by spo
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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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