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To Remove Gold from Silver

1. Gold is taken from the surface of silver by spreading over it a paste, made of powdered sal ammoniac with aqua fortis and heating it till the matter smokes and is nearly dry, when the gold may be separated by rubbing it with the scratch bruch.

2. – The alloy is to be melted and poured from a height into a vessel or cold water, to which a rotary motion is imparted, or else it is to be poured through a broom. By this means the metal is reduced to a fine granular condition. The metallic substance is then treated with nitric acid, and gently heated. Nitrate of silver is produced, which ca be reduced by any of the ordinary methods; while metallic gold remains as a black sediment, which must be washed and melted.