General Finishes Ready To Match (RTM) Stain System makes color-matching a breeze. The system consists of 10 ready-to-use water-based stains, plus a clear base; a chip box with 78 color formulas on two-sided color chips plus stock color chips; and a formula book available in print/digital format to calculate any quantity of stain. Intermix the stains and base to design your own rich, deep wood stain colors.