Phthalo Blue Red Shade is a single pigment paint. All Phthalo pigments have and extremely high tinting strength. In mass tone they are extremely dark in value, often overlooked on the shelf since they appear black. They are also highly transparent in nature. Therefore, they are an excellent choice for extending with wax medium for glazing techniques. When used for mixing other colors, only a small amount is needed, as that is indicative of most modern pigments. Phthalo Blue Red Shade is a good choice for mixing purples especially when mixed with Alizarin Crimson or Quinacridone Red.