Why do people have different hair colors?

I have seen more than 10 different hair colors (black, brown, yellow, green, red, purple, pink). I need to know how people each have a different color of hair, and how pink hair is even possible!!Why do people have different hair colors?
Hair dye for green, purple and pink.





Black hair


Black hair is the darkest and most common color of human hair. It has large amounts of eumelanin and is less dense than other hair colors.








Brown hair


Brown hair is the second most common hair color, the most common in Europe and other parts of the world. It is characterized by higher levels of the dark pigment eumelanin and lower levels of the pale pigment phaeomelanin. Of the two types of eumelanin (black and brown), brown-haired people have brown eumelanin; they also usually have medium-thick strands of hair. Brown-haired people are also known as brunettes.





Main article: Blond


Blond hair ranges from nearly white (platinum blond, tow-haired) to a dark golden blond. Strawberry blond, a mixture of blond and red hair - thought to have originated in Celtic and Scandinavian countries - is a much rarer type containing the most amounts of phaeomelanin.





Blond hair can have almost any proportions of phaeomelanin and eumelanin, but both only in small amounts. More phaeomelanin creates a more golden blond color, and more eumelanin creates an ash blond. Blond hair is common in many European peoples, but rare among peoples of non-European origins. Many children born with blond hair develop darker hair as they age.





Auburn hair


Auburn hair ranges from light to reddish brown. The chemicals which cause auburn hair are eumelanin (brown) and phaeomelanin. It is most commonly found in individuals of European descent.





Red hair


Red hair ranges from vivid strawberry shades to deep auburn and burgundy, and is the rarest fully distinct hair color on earth. It is caused by a variation in the Mc1r gene and believed to be recessive. Red hair has the highest amounts of phaeomelanin and usually low levels of eumelanin.





Grey and white hair


Grey hair color typically occurs naturally as people age (see ';Effects of aging on hair color';, below). For some people this can happen at a very young age (ie: at the age of 10). The same can be said for white hair. In some cases, grey hair may instead be caused by thyroid deficiencies or a deficiency of B12.Why do people have different hair colors?
Non natural colours are from artificial dies, otherwise, natural hair colours come from different alleles acting from chromosomes splitting and crossing over during the first stages of reproduction and fetal development.
the only real hair color is black, dark brown, brunette, red and blond.. other than that are all because of dye material..





PEACE =D
green, purple, and pink hair would have to be dyed...