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 Remove Scale from Steel
| surface is obtained; then damp the surface Scale may may be removed from steel articles by with a little oil, and lay the file on a piece of pickling in water with a little sulphuric acid red-hot iron, bright side upwards. In about in it, and when the scale is loosened, brushing a minute the bright surface will begin to turn with sand and a stiff brush. yellow; and when the yellow has deepened water.