What color is not considered a primary color?

The "primary" colors of light are red, blue and yellow. All other colors are combinations of those three. Red and blue make purple; blue and yellow make green. Red and yellow make orange. Al three in equal measure are white.

When it comes to pigments, the three primary colors are cyan, magenta and yellow. Most color printers use CMYK; Cyan, Magenta, Yellow, and blacK.