Colour theories
It is important to understand that there are two different colour systems: 'additive' and 'subtractive'. Coloured pigments, as in printed inks are termed 'subtractive'. The diagram on the right side show that when all 3 colours (RGB) are combined together they make a dark brownish colour, close to, but not quite black. Light on the other hand is an ‘additive’ system and when the three primary colours of light are mixed, white is produced.