Important: Safety Warning
This page describes trade processes that use dangerously toxic materials such as cyanide solutions, mercury amalgams, or strong acids. These processes require training, equipment, and precautions far beyond what the text describes.
This information has been left in for historical purposes but should not be acted upon.
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Ruby
Take 40 parts paste, and dry, powder, and repeat the process a second 1 part oxide of manganese. Or: 1 part topaz and a third time in a clean crucible, observing paste that has turned out opaque, and 8 parts to separate any revived lead. To the third strass; fuse for 30 hours, cool, and fuse small frit add nitre, 5 drachms, and again melt. pieces before a blow-pipe. Or: 8 ounces strass, Very brilliant. Or: Carbonate of lead, 8 oun- 84 grains each precipitate of cassius (see Nos. ces; powdered borax, 2 ounces; rock crystal, 2720 to 2723), peroxide of iron, golden sul- 3 ounces; manganese, 1/21 grain; mix, and pro- phuret of antimony, and manganese calcined ceed as last. with nitre; add 1 ounce or more of rock crys-