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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Anhydrous Phosphoric Acid
tallize, but it may be made to do so by distill- This is evolved by burning phosphorus in a ing it from a little lime. The portion col- stream of dry air, or under a bell-jar, copiouslected has, at ordinary temperatures, and up ly supplied with dry air. The product is to 3650 Fahr., scarcely any odor save a faint anhydrous phosphoric acid in snow-like flakes. one resembling that of geranium leaves. The These must be collected immediately, and put addition of about 4 drops per fluid ounce of into a warm, dry, well-stoppered bottle. A the French oil of geranium will still further few seconds' exposure to the air causes the mask the slight odor of the acid, and has an anhydrous acid to deliquesce into a syrupy additional advantage of liquefying the pure liquid, its attraction for water being intense. crystallized product. The pure acid may be Its anhydrous state cannot be restored after dissolved in 230 parts of water, and used as deliquescence or solution.