Definition for Eumelanin
From Biology Forums Dictionary
Eumelanin is the best-known form of melanin, providing primarily black colours. Eumelanin is found in the hair and skin of humans, and it colours the hair grey, black, yellow, and brown. Eumelanin exists in two forms, black eumelanin and brown eumelanin. Black melanin produces black colours when it is present in large quantities, and grey colours when it is rarer.
Brown eumelanin may produce brown hair colours when it is present in abundance, but smaller anmounts produce lighter brown, or blond, hair colours. The black variant of eumelanin is commonest in people of non-European descent, whereas ethnic Europeans more often have the brown eumelanin variety.