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Paint thinners are diluents — solvents used to adjust the viscosity of paint, as well as similar preparations such as varnish and lacquer, by dilution.[1][2] Organic solvents labelled "paint thinner" are usually turpentine or white spirits / mineral spirits for the use of diluting oil-based paints only. For water-based paints, such as acrylic paints, water is the primary solvent, but notably, may not always be the only solvent.