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157:"pitch bowl" for smaller ones. The bowl, typically 6 to 20 cm in diameter, can be placed over a sand bag or leather ring, and tilted to whatever angle is most convenient. Its weight (3–4 kg when filled) will keep it firm enough for most jewelry work.
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Generally, chaser's pitch must become soft or even liquid when heated at moderate temperatures, in order to fit the object and fill all its nooks and crannies. For many uses, it is desirable that the pitch is soft like
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while it is still cool enough to be molded with the fingers. On the other hand, at room temperature it must be hard enough to hold the object. It must strongly adhere to the metal while it is cooling.
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For deep repoussé or chasing works, the pitch is usually applied as a thick layer on top of some backing material that can accommodate larger deformations.
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as used by plumbers may also be used, although it creates a fire hazard since the pitch (and any vapors it may release when hot) are flammable.
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For repoussé or other metalworking, the pitch is usually poured or pressed while hot into a "pitch tray" for larger pieces, or in a heavy
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There are many varieties of chaser's pitch available, that differ on the nature or the ingredients, physical properties (such as
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The pitch is heated until molten. Plaster of Paris is added a small amount at a time. Resin and tallow are then mixed in.
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176:. A blow torch can also be used to burn the residues, if the object can withstand the temperature.
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is a preferred way to heat up the pitch (and, if necessary, the metal object). A powerful
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Chaser's pitch has indefinite shelf life and can be re-melted and re-used indefinitely.
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Pitch residues stuck to the object can be removed with an appropriate
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200:" proper, that provides the basic adherence and fusibility;
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Thermal setting adhesive used by metalwork artisans
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65:(embossing) while it is being hammered out.
192:Chaser's pitch is usually a combination of
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85:), or place of origin. Names include
61:artisans to hold a metal plate for
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309:Jewelry Concepts & Technology
146:Pitch bowls holding work pieces
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1:
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203:a "filler", such as powdered
285:while grinding or polishing.
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246:A typical recipe could be:
226:The pitch can be a form of
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10:
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253:20 parts plaster of Paris
234:, or can be derived from
312:. Doubleday; 864 pages.
63:repoussage and "chasing"
335:Visual arts terminology
222:, that makes it softer.
306:Oppi Untracht (2011):
211:, to improve firmness;
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345:Sculpture techniques
107:black chaser's pitch
103:green chaser's pitch
220:Venetian turpentine
130:could also work. A
238:of various trees.
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59:metal cold-working
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16:(Redirected from
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340:Jewellery making
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209:plaster of Paris
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39:Chaser's pitch
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318:9780307784117
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87:Swedish pitch
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41:is a thermal
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18:Chasers pitch
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99:German pitch
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57:, and other
55:coppersmiths
51:silversmiths
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188:Composition
138:Receptacles
329:Categories
290:References
218:, such as
174:turpentine
172:, such as
132:blow torch
128:hair dryer
79:fusibility
47:goldsmiths
283:gemstones
232:petroleum
216:emollient
180:Recycling
155:cast iron
34:Red pitch
273:See also
256:4 parts
124:heat gun
113:Handling
83:hardness
45:used by
43:adhesive
262:1 part
242:Recipes
228:asphalt
170:solvent
164:Cleanup
118:Heating
105:, and
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264:tallow
236:resins
205:pumice
258:resin
198:pitch
95:Brown
314:ISBN
93:(or
81:and
214:an
207:or
196:a "
91:Red
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297:^
122:A
109:.
101:,
97:)
89:,
53:,
49:,
20:)
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