The standard subtractive primaries cyan, magenta, and yellow combine pairwise to make subtractive secondaries red, green, and blue (which themselves are additive primaries, or in practice somewhat darker and less-saturated versions of typical additive primaries). Combining all three primaries (center) absorbs all the light, resulting in black. For real pigments, the results would be somewhat complicated by opacity and mixing behavior, and in practice adding a fourth pigment such as black may be helpful.