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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Platinum Lustre
To bichloride of platinum (a solution of platina in aqua- ca (quartz, flint or rock crystal), 8 ounces; salt of tartar, 24 ounces; mix, bake, cool, aqua -ca (quartz, flint or rock crystal), 8 ounces; regia), is added drop by drop a mixture of salt of tartar, 24 ounces; mix, bake, cool. spirit of tar and balsam of sulphur in equal proportions, until by a trial the composition is found to give the required result. This gives wash with dilute nitric acid, and afterwards with water; dry, powder, add 12 ounces pure carbonate of lead, and to every 12 ounces of ARTIFICIAL GEMS. ore, 26 grains calcined bones. Or: 10 pounds paste, and 1/2 pound calcined bones. the mixture add borax, 1 ounce; triturate in a porcelain mortar, melt in a clean crucible, and pour the fused compound into cold water;