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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Chrome Yellow
To a solution 2711. Mineral Green, Scheele's Green, of bichromate of potash add a solution of or Arsenite of Copper. Dissolve 11 ounces nitrate of lead as long as a precipitate white arsenic and 2 pounds carbonate of potforms. Wash the precipitate, and dry it with ash, by heat, in a gallon of water. Dissolve a gentle heat. An inferior kind is said to be also 2 pounds sulphate of copper in 3 gallons made by 4 pounds pure white lead, 1 pound water. Filter each solution separately, and bichromate of potash, and 20 pounds water, add the former gradually to the latter as long and boiling till the water becomes colorless. as it occasions a precipitate. Wash the pre- Or 75 parts of precipitated sulphate of lead cipitate, drain it, and dry it. may be acted on by 25 parts of a hot solution 2712. Emerald Green. Mix 10 parts of neutral chromate of potash. A mixed pro- pure verdigris with sufficient boiling water to duct of chromate and sulphate of lead is thus form a soft pulp, and strain this through a obtained, which is said to cover as well as sieve. Dissolve 9 or 10 parts white arsenic in the pure chrome, and is much cheaper. (Riot.)