Important: Safety Warning
This page contains a formula or preparation using substances now known to be dangerously toxic, such as arsenic, mercury, lead, or cyanide compounds. Exposure to these substances can cause severe poisoning, permanent injury, or death.
In addition, 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.
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Chinese Bronze
Take 2 ounces This is the process each verdigris and vermilion; 5 ounces each of giving a bronze-like or an antique alum and sal-ammoniac, all in fine powder, metallic appearance to the surface of copper, and sufficient vinegar to make a paste; then brass, and other metals. This is generally spread it over the surface of the copper, preof the copper, preeffected by the action of some substance viously well cleaned and brightened; uniand brightened; uniwhich combines with and changes the nature formly warm the article by the fire, and afterby the fire, and afterof the surface of the metal. The application wards well wash and dry it, when, if the tint of powdered bronzing substances, made to be not deep enough, the process may be redeep enough, the process may be readhere by sizing, &c., to the surface of other peated. The addition of a little sulphate of material than metal, such as wood, plaster, copper inclines the color to a chestnut &c., is termed surface bronzing. (See Nos. brown; and a little borax to a yellowish 3382, &c.) brown. Much employed by the Chinese for