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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Cast Iron, To Chill
Use soft-water, 10 gallons; salt, 1 peck; oil of vitriol, 1/2 pint. Heat to a cherry red and dip, continuing to dip until hard enough. See CASE-HARDENING.