Dichromats have two types of color receptors.
Derval says dichromats are likely to wear black, beige and blue.
If you see between 20 and 32 colors, you have three types of color receptors.
About 50 percent of the population are trichromats.
If you see between 33 and 39 colors, you are a tetrachromat and have four types of cones.
Derval says tetrachromats are irritated by the color yellow but are less likely to be tricked by the blue/black or white/gold dress, no matter the lighting.
Only about 25 percent of the population is tetrachromat.
there are 39 different colors in the test.

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