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 Bleach Sponge
Sponge fortius (sce No. 1439), when the gutta percha will be precipitated in the form of a brilliantly the gutta percha may be bleached almost snow-white by rope- will be precipitated in the form of a brilliantly titions of the following process: Soak it in white tenacious mass, which is pounded toprocess: Soak it in white tenacious mass, which is pounded todiluted muriatic acid 10 or 12 hours, then wash gether in a mortar, and rolled into cylindrical sticks. or 12 hours, then wash gether in a mortar, and rolled into cylindrical it with water and immerse in a solution of sticks. hyposulphate of soda to which a small quantity of diluted muriatic acid has been added.
Wash and dry it.