Stain
A discoloration that can be clearly distinguished from the surface / From Wikipedia, the free encyclopedia
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For other uses, see Stain (disambiguation).
"Coffee stain" redirects here. For the video game company, see Coffee Stain Studios.
A stain is a discoloration that can be clearly distinguished from the surface, material, or medium it is found upon. They are caused by the chemical or physical interaction of two dissimilar materials. Accidental staining may make materials appear used, degraded or permanently unclean. Intentional staining is used in biochemical research and for artistic effect, such as wood staining, rust staining and stained glass.