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In a letter to his brother Theo in 1882, Van Gogh wrote: "There are but three fundamental colours – red, yellow, and blue; 'composites' are orange, green, and purple. By adding black and some white one gets the endless varieties of greys – red grey, yellow-grey, blue-grey, green-grey, orange-grey, violet-grey. It is impossible to say, for instance, how many green-greys there are; there is an endless variety. But the whole chemistry of colours is not more complicated than those few simple rules.