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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To Dissolve Soft Solder
Nitric acid may be used safely for gold not lower than 12k, and is very effective. The following is suitable for all grades of gold and silver: Green copperas, 2 oz; saltpeter, 1 oz., reduced to a powder and boiled in 10 oz. of water. It will become crystalized on cooling. Dissolve these crystals by the addition of 8 parts of spirits of salts to each part of crystals, using an earthenware vessel. Add 4 parts of boiling water, keep the mixture hot, and immerse the article to be operated upon, and the solder will be entirely removed without injuring the work.