A patina is a colorization effect formed on copper, bronze, brass or other metal by natural weathering or by artificial treatment with chemicals. Patina Chemicals are chemicals used by metal artists to create different colored patinas. Patinas can provide a protective covering to materials that would otherwise be damaged by corrosion or weathering. They may also be visually appealing. On metal, patina is a coating of various chemical compounds such as oxides, carbonates, sulfides, or sulfates formed on the surface during exposure to atmospheric elements, a familiar example of which is rust which forms on iron or steel when exposed to oxygen. Learn more about City Chemical LLC.
source https://www.citychemical.com/patina-chemicals.html
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