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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Blackish Bronze Coloring
For giving silvery-grey alloys a blackishbronze color, they are treated with a solution of hydrochlorate of copper diluted with a considerable quantity of water, and a small quantity of nitric acid may be added.