Wiki / STAIN

(1) [as related to abrasive blast and power tool cleaning methods] An area of a surface which, when compared to adjacent areas, has an equal surface profile but is discolored (usually darker) with a material having no apparent volume. The material cannot be removed by methods commonly used to remove dust, but can be removed by more thorough abrasive blasting when abrasive blasting is used, or more thorough power tool cleaning when power tool cleaning is used. (2) A solution or suspension of coloring material formulated to provide a color to a surface,  especially wood, without completely hiding it or forming a continuous film.

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