Nipple color is determined by genetics and the amount of melanin in the skin. There is no natural way to permanently change the color of your nipples. If you have concerns about the color of your nipples, it's best to consult with a healthcare provider for advice and guidance.
If shes mixed with white and black then black
It's all dependent on which race you are. Women from Europe tend to have pink nipples, while those from Africa or Sout America have much darker nipples. There are, of course, always exceptions to the rule.
Nipples become darker when pregnant
No, nipples do not change color in water. The color of nipples is determined by the amount of pigment present in the skin and is not affected by being in contact with water.
Brown
No. They have different sized different for different sized nipples.
No, most people have nipples that are darker(if only slightly) than the skin. This doesn't mean anything is wrong with you though. My friend's nipples are like that. Don't ask how I now :)
people can have different eye color because of the probalility that their parents have different eye color.
Some nipples are differnt mainly because the color is varied in other parts of the skin. There is no problem with it.
Her skin tone.
Her nipples are BLUE