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.
Sulphuric Acid
This is a color- gradually to it 14 fluid ounces distilled water; less. odorless acid, and highly corrosive filter through paper, and pass sufficient disliquid, formed by the union of 1 equivalent of tilled water through the filter to make the sulphur and 3 of oxygen. It is immediately diluted acid measure 1 pint. The specific colored by contact with organic matter. It gravity of this mixture is 1.082. The officinal attracts water so rapidly from the atmosphere, strength of the British Pharmacopœia is when freely exposed to it, as to absorb somewhat greater; sufficient distilled water its weight in 24 hours; and, under continued is added to 1350 grains sulphuric acid, so that, exposure, will absorb 6 times its weight. after it has been shaken and cooled down to 60° Fahr., it measures 1 imperial pint. The sulphuric acid, heated to nearly its boiling specific gravity of this is 1.094. point, and continuing the heat until the dark color at first produced disappears, when it should be distilled. Another method is by adding 1/80 to 1/2 of 1 per cent. of sulphate of