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A wood stain is used to change the appearance of the wood, such as to bring out the definition in the wood grain or match the look of another species of wood. Semi-transparent stains provide a color to the wood, but still allow the texture and natural grain to show through. Solid-color stains allow the texture to show, but not the grain. Varnish, which may be water- or oil-based, provides a clear, transparent coating that is durable and hard. Varnishes also come in a variety of shines from flat to high gloss, and they may be water or oil based.