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.] Several curious secrets relating to ivory, bone, and horn, pp. 277-283
28 2 TrIE LAE0I ATORY. let it stand a little, and, after you have poured it off, either scrape or melt the wax ; wipe it with a clean rag, and polish it. Instead of the solution of silver, you may boil Ii- tharge of silver in a strong lye made of quick-lime, so long, till it becomes of a black tincture : or, instead of silver, you may dissolve, lead in aqua-foris. To solder florn together, after it'has been lined with pro- per Foils or Colours. TAKE two pieces of horn, made on purpose to meet together, either for handles of knives, razors, or any thing else ; lay foils of what colour you please on the in- side of one of the horns, or, instead of foils, painted or gilded paper, or parchment ; then fix the other piece upon it; lay a wet linen fillet, twice doubled, over the edges, and with a hot iron rub it over, and it will close and join together as firm as if, made one piece. To dye Horn of a Green Colour. TAKE two parts of verdigrise, one-third part of sal- ammoniac; grind them well together; pour on strong white-wine vinegar, and it will be tinctured of a pleasant green: then put your horn into it, and let it lie therein till you see it tinged to what height of colour you would have it. Or, Take the green shells of walnuts; put them into a strong lye, with a little vitriol and alum, and let it boil for two hours; lay the horn for two days in strong vinegar; then put half an ounce of verdigrise, ground with vinegar, into the lye ; boil the horn in it, and it, will be of a fine green.
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