Secondary colours

 

Cyan, magenta and yellow are called secondary colours. Red, green and blue are called primary colours.

Both sets of colours can be called complementary colours. For example, cyan is minus red, so cyan and red are complementary colours. Yellow is minus blue, so yellow and blue are complementary colours and magenta is minus green, so magenta and green are complementary colours.

Complementary colours produce white when mixed together in equal parts.