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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Recovery of Silver, Gold, Etc
The image should very soon appear, and may be developed until the shadows become slightly tinged. Then wash the surface and back of the plate freely with water, and rinse with a little very dilute acetic acid; say 2 drops of glacial acid to the ounce. Wash again, and if any intensification is required, it may be accomplished by adding to 2 drs. of water 3 drops of No. 3 and 3 of No. 5 solution. When dense enough, wash and fix with cyanide, 20 grs. to the ounce of water.