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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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Vegetable Cement
A good vegetable cement may be prepared by mixing gum-arabic with nitrate of lime. The latter is prepared by dissolving an excess of marble in nitric acid, and filtering. The filtered solution will contain 33.3 per cent. nitrate of lime, which may be dried by evaporation.
For the cement, take 2 parts by weight of the a thick paste with the necessary quantity of nitrate of lime, 20 parts pulverized gum- The mixture water, mixing thoroughly. It must be used arabic , and 25 parts water. immediately. After application, it should be can be further diluted to adapt it to the uses exposed to warmth, gradually increasing al- to which it is to be applied. In the manufacto which it is to be applied. In the manufacmost to white heat. This cement is very ture of artificial stone, a cement of a similar hard, and presents® complete resistance alike character has been found to serve a good purcharacter has been found to serve a good purto a red heat and boiling water. pose. Something of the kind is used in the