eumelanin

1.The eumelanin has been bleached by the sun, and the red color is showing through, however slightly.

这是因为在阳光下，真黑素被淡化，而则现，虽然十分微弱。

2.Eumelanin is responsible for the darker colours such as black, blue, chocolate brown and phaeomelanin causes the lighter yellow/red colours such as tan, red, yellow.

真黑素决定了深系，如黑、、巧克力；棕黑素则影响浅的黄系，如、、黄。