Series editors' preface - Wood Tools

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Table 5.1 Class characteristics of selected commercial ivories pinkish coloration than ivory, and on close examination show tiny striations if cut and polished. Other palm species such as the African doom palm (Hyphaene thebaica) and the South Pacific species Metroxylon amicarum also produce ivory-like nuts but are less commonly encountered or marketed than Phytelephas macrocarpa. Synthetic polymers or plastics have been used to imitate ivory since they were first produced. Indeed the impetus behind the development of cellulose nitrate or celluloid, one of the earliest plastics, was the desire to find a replacement for ivory billiard balls. Pigmented and layered celluloid was made to at least superficially copy the grain of elephant ivory. Recent restrictions on the ivory trade have given fresh impetus to the manufacture of imitation ivory. Identification of ivory, bone and antler Pieces of furniture composed of bulk material or unmodified structures present few problems Other materials and structures 199 Source Modified tooth Macroscopic characteristic Microscopic Enamel UV characteristic characteristic (10) Elephant (Asian and African) Mammoth Walrus tusk Walrus teeth Killer/sperm whale Narwhal Hippopotamus Hippopotamus Hippopotamus Wart hog Upper incisors Upper incisors Upper canines All teeth All teeth Upper incisor Upper canines Lower canines Lower incisors Upper and lower canines Schreger angles > 115° in cross-section Schreger angles > 90° in cross-section Secondary dentine in cross-section Cementum rings in crosssection; hypercementosis Dentine rings in crosssection Spiral; hollow centre in cross-section Oval cross-section angular TIZ Triangular cross-section; angular TIZ Peg-shaped; no TIZ (dot) Squared cross-section; linear TIZ Fine concentric lines in crosssection Fine concentric lines in crosssection Fine concentric lines in crosssection Fine concentric lines in crosssection Tip worn away Tip worn away Tip may be worn Tip Tip worn away Longituinal band Longituinal band Tip Longituinal band Vivianite may be present TIZ = tusk interstitial zone Source: Edgard O. Espinoza and Mary-Jacque Mann (1992) Identification Guide for Ivory and Ivory Substitutes, 2nd edn, World Wildlife Fund, Washington, DC, with permission of identification (Burek, 1989). While microscopy is often necessary to accurately assign a species origin to small, heavily worked or degraded material, much useful identification relies on an understanding of the structures involved and examination with the naked eye. A scheme developed by Espinoza and Mann (1992) for the preliminary characterization of ivory and ivory substitutes in cross-section is shown in Figure 5.7. Table 5.1 shows class characteristics of selected commercial ivories. Krzyskowska (1990) has proposed a diagnostic flow chart, based on the physical characteristics of the material, to distinguish between elephant, mammoth and hippopotamus ivory, boar tusk, bone and antler. Penniman’s (1952) classic identification guide for osseous materials and vegetable ivory, with photographs of transverse and longitudinal sections at low magnification, remains valuable. A comparative study by S. O’Connor (1987) of new and archaeological samples of osseous and keratinaceous materials includes
200 Conservation of Furniture Figure 5.8 (right) Transverse view of an elephant tusk with Schreger lines (angles marked). The outer cementum is also present. (left) Transverse view of a walrus tusk with outer primary dentin and inner secondary dentin, sometimes called ‘tapioca’ photographs of macroscopic and microscopic structures. Distinctive patterns of decay, such as the cone in cone splitting of elephant ivory, may also assist in the identification of these materials (S. O’Connor, 1987, T.P. O’Connor, 1987). Ivory from any source is free of visible pits or channels, while antler and bone are pitted overall with the small lacunae (voids) left by the collapse of the cell nuclei. Blood vessel channels are also apparent in antler and bone. Both the lacunae and the channels often pick up dirt and become more accentuated (as seen in the sperm whale jaw bone in Figure 5.2). (a) (b) Bone and antler are more heavily mineralized than ivory and are therefore usually more opaque and whiter in colour. Uniquely in Proboscidean (elephant or mammoth) ivory the arrangement and form of the tiny tubules radiating outward through the dentine from the central pulp cavity gives rise to a characteristic pattern, believed to be an optical phenomenon. On cross-sectional surfaces this pattern has been described as ‘engine turnings’. Small lozenge or diamond shapes are formed by the intersection of arcs which radiate out from the centre (Figure 5.8). These arcs, called Schreger lines, form angles at their intersections which can be used to differentiate ivory from extant and extinct species (Espinoza and Mann, 1992). The angles are obtuse in elephant ivory (> 115°) and acute in mammoth ivory (< 90°). This feature can be seen by eye, under low magnification or with crossed polarized light (Thornton, 1981). Schreger lines are caused by the regular sine-wave form of the tubules in the radial direction (Figure 5.9). They are seen only on the cross-section or ‘end grain’ of proboscidean ivory. Longitudinal surfaces show either a layered or wood-like grain depending on the orientation of the viewing surface. Plastic substitutes can be non-destructively differentiated from the real thing by the absence of any evidence of complex structure of biological origin. Espinoza and Mann (1992) suggests a spot test with sulfuric acid to differentiate ivory from vegetable ivory. Figure 5.9 Schreger lines are caused by the regular sine-wave form of the tubules in the radial direction (a) Radial section of mammoth ivory under cross-polarized light (15.6) showing a regular tubule wave in the radial direction. (b) Cross-section of a mammoth tusk (20° off cross-polar light source, 16) showing the curl of the tubules that give rise to Schreger lines and the typical grain pattern
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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
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Plastics and polymers, coatings and
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Melamine formaldehyde (MF) Phenol f
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Polyurethanes (PUR) Poly(vinyl acet
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Page 180 and 181:
Page 182 and 183:
Page 184 and 185: Plastics and polymers, coatings and
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 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
Page 260 and 261: Table 5.3 Pigments - continued Othe
Page 262 and 263: Table 5.3 Pigments - continued Othe
Page 264 and 265: Table 5.3 Pigments - continued will
Page 266 and 267: Table 5.4 Some traditional colorant
Page 268 and 269: parent to X-rays. X-ray diffraction
Page 270 and 271: Larsen, E.B. (1984) Electrotyping,
Page 272 and 273: Van Duin, P. (1989) Two pairs of Bo
Page 274 and 275: Part 3 Deterioration
Page 276 and 277: 6 General review of environment and
Page 278 and 279: which water, oxygen and other react
Page 280 and 281: standard free energies of starting
Page 282 and 283: 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
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
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adhere the unwanted varnish or dirt
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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
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(a) (b) Figure 11.19 Orientation of
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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
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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
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Identifying a historical progressio
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normally seen, so that it can be mo
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Figure 13.4 Parafilm ® is a thin w
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of an overall finishing strategy. I
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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
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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
Page 678 and 679:
eflective shine, whilst oil gilding
Page 680 and 681:
is used for laying gold and silver
Page 682 and 683:
wood be dry, free of grime, oil and
Page 684 and 685:
necessary to use a size coat as str
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however, makes it more difficult to
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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
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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
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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
Page 734 and 735:
(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
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solvent creeping behind or undernea
Page 746 and 747:
Snow, C.E. and Weisser, T.D. (1984)
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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
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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
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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
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may be appropriate for leather lini
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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
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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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