Life Style / Painting / Copper Staining: Usually caused by corrosion of copper screens, gutters or downspouts washing down on painted surfaces. Can be prevented by painting or varnishing the copper.
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Lifestyle / Painting / Non-Staining Colors: Pigments that can be lifted cleanly (wet or re-wet) with little or no discoloration of the underlying paper fibers. MORE
Lifestyle / Painting / Staining Colors: Colors that cannot be fully removed from your paper. Staining colors permeate the fiber of the paper and leave a permanent tint. Check your hands after painting, the hardest colors to wash off are usu MORE
Entertainment / Photography / Staining Developer: Developer, such as pyro, in which the oxidation products give extra image density by staining the gelatin. MORE
Entertainment / Photography / Copper Toning: Chemical process used for toning monochrome prints. See toners. MORE
Entertainment / Photography / Copper Sulfate: Chemical contained in certain bleaches, toners, intensifiers, and reducers. MORE