A model is introduced which can predict tone and mix colors in textile printing. The factors which make this a more difficult process than match prediction for the textile dyeing and paint industries are highlighted. The model is capable of handling prints made with both reactive dyes and pigment colors, and is extended to deal with paste white colors. The Kubelka-Munk equations are solved for negative absorption coefficient, in order to treat colors whose reflectance slightly exceeds that of the substrate.