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To Make Fireproof Paper (Copying paper is prepared)

The copying paper is prepared by being Take a solution of alum and dip the paper wetted with a solution of 200 grains of the into it, then throw it over a line to dry. This yellow or neutral chromate of potash in 1 galis suitable to all sorts of paper, whether plain lon of distilled water. This paper can be or colored, as well as textile fabrics. Try a used immediately, or may be dried, and slip of the paper in the flame of a candle, and damped with water when required for use. if not sufficiently prepared, dip and try it a second time.