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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Blue Sympathetic Inks
Writing with copperas turns blue if wetted with a solution of prussiate of potassa.
Nitrate of cobalt turns blue on being wetted with a weak solution of oxalic acid.
Rice water or a solution of boiled starch tity of finely powdered indigo and lampblack 2536. Brown Sympathetic Ink. A to color; lastly, let it stand for 2 or 3 hours, diluted solution of nitrate of silver turns until the coarser powder has subsided, and brown by exposure to the sunlight. bottle for use. Use this fluid with a clean 2537. Yellow Sympathetic Ink. pen, and keep it in glass or earthen inkstands, Chloride of antimony, used as the ink, will beantimony, used as the ink, will beas many substances will decompose it while come yellow by moistening with a decoction in the liquid state. When dry it will resist of galls. the action of water, oil, turpentine, alcohol, 2538. Green Sympathetic Ink. Ardiluted sulphuric acid, diluted hydrochloric seniate of copper, washed over with nitrate acid, oxalic acid, chlorine, and the caustic of copper, turns a beautiful green. alkalies and alkaline earths.