Important: Safety Warning
This page describes practices involving highly flammable materials in ways that create a serious risk of fire or explosion.
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.
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Pale Boiled Oil
Boil 1 quart linseed oil, and 2 ounces powdered white vitriol (sulphate of zinc), with 1 quart water, until the water has all evaporated; settle and decant as in the last receipt.