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Two possible tetrachromats have been identified: "Mrs. M," an English social worker, was located in a study conducted in 1993, and an unidentified physician, also in England.
Mrs M - an English social worker, and the first known human "tetrachromat" - sees rare subtleties of colour. Looking at a rainbow, she can see 10 distinct colours. Most of us only see five.
That's what I've been thinking about though. All the colours we can make, come from just 3 main ones; red, blue and yellow. But what if there were more, other basic colours that you can't make from those three?