Looking for Madam Tetrachromat: There have been very few attempts to find Madam Tetrachromat. The one that turned up Mrs. M in England, in 1993, was led by Gabriele Jordan, then at Cambridge University and now at the University of Newcastle. She tested the color perception of 14 women who each had at least one son with a specific type of color blindness. She looked at those women because genetics implies that the mothers of color-blind boys may have genetic peculiarities of their own. Among that somewhat peculiar group of women, one could expect to find the odd tetrachromat.
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