RALPH EAGLE / SCIENCE PHOTO LIBRARY RALPH EAGLE / SCIENCE PHOTO LIBRARY
Colour. Artwork of three overlapping circles of colour. This shows how all colours are made up of just three: the primary colours of red, green and blue. Where the circles overlap, they form the secondary colours of magenta, yellow and cyan (blue-green). At the centre of the circles is white, made up of all the colours. Outside of the circles is black. By mixing the primary colours in varying amounts, all possible colours can be made.
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