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stain
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. Staining is used for biochemical research, metal staining, and art (e.g., wood staining, stained glass).
==Types of stains==
There can be intentional stains (such as wood stains or paint), indicative stains (such as food coloring or adding a substance to make bacteria visible under a microscope), natural stains (such as rust on iron or a patina on bronze), and accidental stains such as ketchup on a shirt.
Different types of material can be stained by different substances, and stain resistance is an important characteristic in modern textile engineering.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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