(A) Black is not a primary colour. Primary colours are basic colours that can be mixed together to produce other colours. They are red,green and blue. The primary colors are those which cannot be created by mixing other colours in a given colour space.For subtractive combination of colours, as in mixing of pigments or dyes for printing,the primaries normally used are cyan, magenta, yellow and black (CMYK) though the set of red, green, blue is popular among artists.