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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Papyrine
Dip white unsized paper for a minute in strong sulphuric acid, and afterwards in water containing a little ammonia. When dried it has the toughness and appearance of parchment.