How the natural pigmentation affects the hair colour?

Natural pigmentation in hair is primarily determined by the presence of melanin, which is produced by melanocytes in the hair follicles. There are two main types of melanin: eumelanin, which can be either black or brown, and pheomelanin, which gives hair a yellow or red hue. The ratio and concentration of these pigments influence the overall hair color, resulting in shades ranging from blonde to black. As people age, the production of melanin decreases, leading to gray or white hair.