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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Bright Red
Cochineal, ground, 1 ounce. Boil with 1 pint of water, replacing that which evaporates. Towards the close add cream tartar, 1/2 ounce alum, 1 ounce; above solution and treat it with nitric and and when cold, oil of vitriol, 1 ounce, mixed sulphuric acids, until it is changed into the with 1/2 pint of water.