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.
Acid Proof Cement
Form a paste of powdered glass and a concentrated solution of silicate of soda.
Cement for Thin Metal Sheets. Cut isinglass into small pieces and dissolve in a little water at a moderate heat; add a small quantity of nitric acid, the quantity being determined by experiment; with too much acid the cement dries too slowly, while with too little it does not adhere well. Cement for Glass and Brass. Melt together 1 part of wax and 5 parts of resin, and after melting stir in 1 part of burned ochre and 1/4 part plaster of