Smith, G. / The laboratory; or, School of arts: containing a large collection of valuable secrets, experiments, and manual operations in arts and manufactures, highly useful to gilders, jewellers, enamellers, goldsmiths, dyers, cutlers, pewterers, joiners, japanners, book-binders, plasterers, artists, and to the workers in metals in general; and in plaster of paris, wood, ivory, bone, horn, and other materials
[Part VI.] Of coral work, pp. 292-293
ifii LA-BORATORY. of wine, wi1ch is strong enough to fir gont-power; pu it intO a sand bath, and let it remrain until it i§ dissolved aS muchY as possible ; then let it cool; strai it firodgh a cloth, into a, gfast, so as to separafd i dros tlfat might iave beeh in the higredienti. Tis varnish you may lay on every tiiiig that has been silvered oT tinned, three or ft6ur times, and it will resemible the rightest gold. If yod Would have the gold-Colour Still figh~r, you only add about two grains of trnieic, two grains of the best hepatic d1oe, and onet gtain of the finest drgon's blood, boiling them up, and sttkin- ng through a cldth into another glass. When you would Use it, set the glass into ariy vessel full of water over a gentle charcoal fire, in order to mnake the varnish fluid; it is also requisite to warm the work, before yot begin to varnish it. OF CORAL WORK. 7o make Red Coral Branches, for the Embellishment of Grottos. TAKE clear resin, and dissolve it in a brass pan; to one ounce thereof add two drachms of the finest ver- milion ; when yodi have stirred them well together, and have chose your twigs and branches, peeled 'and dried, take a pencil and paint these twigs all over, whilst the composition is warm, and shape them in imitation of natural coral, out of a black-thorn; when done, hold it over a gentle coal fire; turn the branch with your hand about, and it will make it all over smooth and even, as if polished.
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