What key characteristic distinguishes the Pastel gene's effect on dark pigment from some other 'brightening' genes?

Answer

The deepest pigmentation settles into a milk chocolate brown

The hallmark of the Pastel gene's action on melanin is the shift of the deepest pigmentation into a milk chocolate brown, whereas other brightening genes might act more as a direct pigment reducer.

What key characteristic distinguishes the Pastel gene's effect on dark pigment from some other 'brightening' genes?

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