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.
Home › Spirit Varnishes › Etching Fluid for Copper
Etching Fluid for Copper
Aquafortis, 2 ounces; water, 5 ounces. Mix. 2962. Callot's Eau Forte for Fine Touches. Dissolve 4 parts each of verdigris, alum, sea salt, and sal ammoniac, in 8 parts vinegar; add 16 parts water, boil for a minute, and let it cool.