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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Green without Arsenic
Dissolve 48 pounds sulphate of copper and 2 pounds bichromate of potash in water, and to be blackened by sulphuretted hydrogen. add to the clear solution 2 pounds pearlash When used with oil, they may, with care, re- and 1 pound chalk. tain their color for a long time, the oxidized 2714. Rinmann's Green Pigment. oil protecting them from the action of sul- Dissolve together in sufficient water 1 part phuretted hydrogen. They cannot be used sulphate of cobalt and 3 sulphate of zinc; in silicious, fresco, or any other method of precipitate with carbonate of soda, wash the water painting. They are destroyed by alka- precipitate, and calcine it. It is a permanent lies; they should never be used with Prussian blue or kindred colors. On the whole, it would be as well for artists to reject them, as better and safer pigments can be employed for the same purpose as they are. color.