What is stain?

  • (noun): An act that brings discredit to the person who does it.
    Synonyms: blot, smear, smirch, spot
    See also — Additional definitions below


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).

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Some articles on stain:

Schaeffer–Fulton Stain
... The Schaeffer–Fulton stain is a technique designed to isolate endospores by staining any present endospores green, and any other bacterial bodies red ... The green stain is malachite green, and the counterstain is safranin, which dyes any other bacterial bodies red ...
Stain Removal - Stain Prevention
... If a stain has "set", it has become chemically bonded to the material that it has stained, and cannot be removed without damaging the material itself ... It is therefore important to avoid setting stains that one wants to remove ... This can be done by avoiding heat (by not pressing or ironing the stain), sponging stained materials as quickly as possible, using the correct solvent (some solvents will act as catalysts on certain ...
Stain Removal - Application of Solvents
... There are four ways to apply a solvent to a fabric for removing stains soaking application of pressure front sponging This is the most common way of treating non-wash ... The stain is rubbed with the sponge radially, from the centre of the stain towards its edge ... the sponge in a circular motion, as that causes the stain to spread in rings ...
Stain - Removal
... to attempt to remove or minimize existing stains, and stain removers are an important type of chemical in laundry detergents ... Some stand-alone stain removers also exist ...
Salt-and-pepper Chromatin - Additional Images
... H E stain A pheochromocytoma showing finely granular chromatin ... H E stain Salt-and-pepper chromatin (pheochromocytoma) ... H E stain ...

More definitions of "stain":

  • (verb): Produce or leave stains.
    Example: "Red wine stains the table cloth"
  • (noun): (microscopy) a dye or other coloring material that is used in microscopy to make structures visible.
  • (verb): Color with a liquid dye or tint.
    Example: "Stain this table a beautiful walnut color"; "people knew how to stain glass a beautiful blue in the middle ages"
  • (verb): Color for microscopic study.
    Example: "The laboratory worker dyed the specimen"

Famous quotes containing the word stain:

    There is rust in my mouth,
    the stain of an old kiss.
    Anne Sexton (1928–1974)

    As for me, Abraham, Isaac, and Jacob are now only the subtlest imaginable essences, which would not stain the morning sky.
    Henry David Thoreau (1817–1862)

    She comes to meet death,
    To stain the altar of the goddess,
    To hold her girl-throat
    Toward the knife-thrust.
    Hilda Doolittle (1886–1961)