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 1 part oxide of manganese. Or: 1 part topaz paste that has turned out opaque, and 8 parts strass; fuse for 30 hours, cool, and fuse small pieces before a blow-pipe. Or: 8 ounces strass, 84 grains each precipitate of cassius (see Nos. 2720 to 2723), peroxide of iron, golden sulphuret of antimony, and manganese calcined with nitre; add 1 ounce or more of rock crystal. Or: 1 pound paste and 3 drachms purplc of cassius. Or: 4 ounces paste, 4 ounces glass of antimony, and 1 drachm purple of cassius; this turns on the orange.