Melanin and you

Melanin is what causes the color to appear in the skin, hair and eyes. But in humans there seems to be a limit to this. For example human hair can be orange(gingers) but not green or blue. iris's can be blue but not yellow or black. What determines the color range of hair and iris's? How can I add (or remove) colors from this range naturally?

The Iris colors I am specifically looking for;

Edit I am not asking about albinism or other conditions, I am asking about common an natural ways for these colors to appear from birth.

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Melanin and you

The Iris colors I am specifically looking for;

The Hair colors I am specifically looking for;

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