Series editors' preface - Wood Tools

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Figure 12.13 Diagrammatic representation of a mouth diffuser or blow atomizer than those applied with a brush. Fast evaporating solvents (e.g. acetone) are not usually used for spraying varnishes. The spray gun atomizes the varnish into fine droplets and vastly increases the surface area to volume ratio. If an excessively fast evaporating solvent is used, the droplets will dry before they reach the surface and will produce a frosted appearance. In some cases this effect can be used deliberately. Mention (1995) describes the use of mastic in ethanol to create a frosted surface, followed by reforming these layers by the application of a thin mastic solution in the usual solvent to which a small amount of benzyl alcohol had been added. This allowed an even varnish layer to be applied to a pitted, dry and uneven paint surface. Some painting conservators recommend against spray application of varnish on panel paintings (Gordon, quoted in Samet, 1997). Mouth diffuser/blow atomizer The mouth diffuser or blow atomizer may be used to apply varnish to small areas of a surface although it has a tendency to produce a somewhat irregular coating (Figure 12.13). Air is blown through the tube and creates an area of negative pressure, drawing varnish from the cup from where it is distributed as a fine mist onto the surface. Blowing must produce a forceful and steady air pressure in order to evenly atomize the varnish droplets. If pressure is inadequate, large and irregular droplets of varnish will mar the sur- Principles of consolidation, aesthetic reintegration and coatings 599 (a) (b) Figure 12.14 Diagram (a) and simplified cutaway (b) of a typical suction cup spray gun showing the air spreader control valve, the fluid needle adjusting screw, and the air cap. The air spreader control valve is used to adjust the shape of the cone of mixed air and coating produced by the gun. The less air travelling through the gun, the more circular the discharged mix. Generally a circular fan shape is required. The size of the fan can be adjusted by either a knob on the body of the gun or a ring on the air cap. The fluid needle adjusting screw regulates the flow of coating. The further the adjusting screw is screwed in, the less coating is sprayed from the nozzle. Air horns on the air cap are positioned in the direction of the hand motion used when spraying face. The varnish should be thin enough to allow very fine droplets to form – a pebbled surface will result if the varnish is too thick. Varnishing horizontal surfaces is easier than vertical surfaces and avoids the formation of sags and drips. Adequate ventilation is necessary and a gentle airflow that moves from behind the person applying the varnish, across
600 Conservation of Furniture (a) (b) (c) Figure 12.15 Diagrammatic representation of the effect of spray gun distance from the surface. The correct distance, usually 20–30 cm, is indicated by an arrow in (b). If the gun is held too close to the surface, excess coating will be deposited and may result in an orange peel effect (a). If the distance is too far, the coating begins to dry before coming into contact with the surface and may result in a pebbled effect (c) and away from the varnished surface is best. Varying the distance and angle between the atomizer and the surface will alter the thickness and saturation of the varnish coat (Zuccari, 1997). Spray guns Spray guns used in furniture conservation generally utilize compressed air combined with a gravity feed or suction cup on the gun. The liquid surface coating is atomized by the flow of a low volume of air compressed to around 30 psi and carried to the surface by the air stream. This system is known as high-pressure–low-volume (HPLV). It requires strong ventilation to remove excess solvent and coating and there is usually significant overspray. It is essential that the gun is adjusted correctly, good spray technique used, the nozzles, needles and air cap sizes correspond and that the output of the compressor matches the throughput of the gun and nozzle. There are two primary adjustments that can be made to regulate the flow and distribution of finish from the gun. These are the air spreader control valve and the fluid needle adjusting screw (Figure 12.14). Other adjustments that can be made include the viscosity of the medium, by increasing or reducing solvent (or pigment) content, air pressure, air flow, the distance between the nozzle and the surface, the evaporation rate of the solution, and the speed of movement across the surface. The spray gun is usually held approximately 20–30 cm (8–12 inches) from the surface, though the exact distance is dependent on the equipment being used (Figure 12.15). Movement of the gun across the face of the surface should maintain this distance evenly (Figure 12.16). The spray gun is usually moved across the surface in horizontal bands, with each successive band slightly overlapping the one before to compensate for the lighter covering at the edge of the fan. The beginning and end of each stroke are prone to receive excess coating, so it may be useful to spray beyond the beginning and end of the surface to ensure even coverage at the edges. A black tile may be used as a test surface for transparent coatings to assess whether the correct adjustments have been made, that spray technique is correct and that the level of gloss is satisfactory. Full sized spray guns are useful for dealing with large areas in a very uniform manner, whilst so-called
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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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CH 2—OOCR l R ll COO—CH O CH
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(c) 4.7.4 Proteins Plastics and pol
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Triterpenoids Plastics and polymers
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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
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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
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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
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alent to low aromatic (c.17-20% aro
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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
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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
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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
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Page 596 and 597: 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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Page 638 and 639: appearance of paintings, Studies in
Page 640 and 641: American Chemical Society, Washingt
Page 642 and 643: 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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Page 650 and 651: Figure 13.4 Parafilm ® is a thin w
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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
Page 660 and 661: Thus conservation grade materials m
Page 662 and 663: 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
Page 670 and 671: during a polishing session. If the
Page 672 and 673: applying fresh polish before pullin
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Page 676 and 677: Roelop, W. (1994) Coloured mordants
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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
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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
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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
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into consideration the importance a
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Alkaline glycerol solution will rem
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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
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The materials used in the decoratio
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solvent creeping behind or undernea
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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
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16.2 Plastics 16.2.1 Introduction t
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PVAC, Paraloid B72, ethylene vinyl
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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
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The principles outlined above for s
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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
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cation and characterization of the
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may not be representative of the ki
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Deoxycholate soap recipe 2 g deoxyc
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that which occurs during the remova
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(a) (b) (c) (d) 16.7.3 Cleaning [1]
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In the past, abrasives such as rott
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Wax has been used many times to inf
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permanently etch the lacquer, leavi
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etouching and coating of lacquer ob
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(a) (b) Figure 16.23 Japanese inro
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Extended exposure to polar solvents
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Retouching may involve reproducing
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ethical considerations. Objects tha
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tion will need to be reduced accord
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(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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