The ADDITIVE colour process

There are two different ways of producing a colour, the additive and the subtractive. In the additive process, all colours can be made by mixing three primary colours: red, green and blue. Yellow, for example, is a mixture of green and red light.

This process was first demonstrated, in 1861, by Sir James Clerk Maxwell. Though this was the first of the two, it was the subtractive process which was to become the standard colour one in our lifetime.