Important: Safety Warning
This page contains a formula or preparation using substances now known to be dangerously toxic, such as arsenic, mercury, lead, or cyanide compounds. Exposure to these substances can cause severe poisoning, permanent injury, or death.
In addition, 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 Bronzing for Brass
Mix 20 drachms hyposulphite of soda with 1 pint water. 3807. Steel-Grey Bronzing for Brass, or Copper. Mix 1 ounce muriate of arsenic with 1 pint water, and use at a heat not less than 180° Fahr. 3808. Dark Drab Bronzing for Copper. This is prepared by adding 2 drachms copper, in pipes and tubes; and bronze, brass, and copper, in machinery and manufactories, as well as for most of the other purposes for which more expensive metals are employed.