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There are technically only three hair colors: black (brunette), blond, and red. Red is a mutation, and as such is very rare.

Brunette is the most common, by advantage of being the primary hair color of the most populous nation of the world. Only those of Oriental heritage can have true brunette hair. All other dark hair colors are a combination of blond or red with brunette.

Those with any shade of red hair must have two copies of a recessive gene on chromosome 16. This causes a mutation in the melanotropin receptor. Only 1-2% of the world's population has red hair (2-6% of those with northern European descent).

Auburn is a combination of brunette and red.

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Q: Is auburn hair the rarest hair color?
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