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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.
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To Dye with Aniline Scarlet
Add to the bath containing the dye, an excess of alum and cream of tartar; neutralize carefully by carbonate of soda-the exact point may be known by the liquid changing from a yellowish to a pinkish red. 2591. To Prepare Bismarck Brown for Dyeing. Mix together 1 pound Bismarck, 5 pounds water, and pound sulphuric acid. This paste dissolves easily in hot water and may be used directly for dyeing. A liquid dye may be prepared by making the bulk of the above mixture to 2 gallons with alcohol.