Important: Safety Warning
This page contains a formula or preparation using substances now known to be dangerously toxic, such as arsenic, mercury, lead, or cyanide compounds. Exposure to these substances can cause severe poisoning, permanent injury, or death.
In addition, 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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Emerald
Lançon's paste (sec bonate of lead, and to every 12 ounces of the No. 2426), 9612 grains; acetate of copper, 72 mixture add borax, 1 ounce; triturate in a grains; peroxide of iron, 1½ grains. Or: Douporcelain mortar, melt in a clean crucible, and ault-Wieland paste (see No. 2425), 4608 grains; pour the fused compound into cold water; green oxide of copper, 42 grains; oxide of dry, powder, and repeat the process a second chrome, 2 grains. Or: Paste, 1 ounce; glass and a third time in a clean crucible, observing to separate any revived lead. To the third frit add nitre, 5 drachms, and again melt. of antimony, 20 grains; oxide of cobalt, 3 grains. Or: Paste, 15 ounces; carbonate of copper, 1 drachm; glass of antimony, 6 grains.
The product is perfectly limpid and extremely 2440. Lapis Lazuli. Paste, 10 pounds; brilliant. 2425. Doualt-Wiéland's Paste or Strass. Rock crystal, 4056 grains; minium, 6300 grains; potash, 2154 grains; borax, 276 grains; arsenic, 12 grains. Or: Sand, 3600 grains; pure carbonate of lead, 8508 grains; potash, 1260 grains, borax, 360 grains; arsenic, 12 grains. 2426. Lançon's Paste or Strass. Litharge, 100 grains; silex, 75 grains; white tartar or potash, 10 grains.