Inside the human hair there are two natural pigments that determine your natural hair colour. These are melanin and pheomelanin. Melanin appears in brownish-black colours and makes up the majority of your base colour or the depth ? how light or dark you are ? whereas pheomelanin appears in reddish-yellow colours and makes up the tones you have in your hair which sometimes you see and sometimes you don?t.
Redheads have a lot of pheomelanin in their hair, hence the appearance of red or copper colours. Asian hair has a lot too, but because of the density and amount of melanin in the hair you cannot see it. If you were to put bleach on the hair, the first colours that would appear would be red/orange/yellow, and often you will not be able to reach a very light blonde or white colour on Asian hair.
Afro hair has a lot of melanin pigment but not much pheomelanin, so when bleached it can lift to blonde very easily. However, the hair structure is often fragile so may not withstand too much bleaching or heavy colouring.
To understand colour even more, we need to go back to our primary colours of red, yellow and blue. If you mix all three you get brown, and depending on the quantities of each that you use, you can get all the different shades of natural hair from black through to very light blonde, which is technically speaking the melanin pigment. The pheomelanin is just two of the colours ? red and yellow ? which can appear orange.
All hair has an ?undercoat? colour, and most colour manufacturers produce a chart to help you gauge what colour that undercoat is. When you apply any type of oxidant or peroxide to hair, the undercoat will lighten according to the strength of the oxidant. If the undercoat is too light for a colour, the colour will fade more quickly; if the undercoat is too warm for the colour required, it will affect the end result of the colour chosen. As a rough guide, you will often find that the darker the natural colour of the hair (e.g. black), the darker the undercoat (red, in this case).
Undercoats are normally always red, orange or yellow, with red being the more dominant colour (being the strongest undercoat) and yellow the least. It is important that you consider the undercoat and yellow the least. It is important that you consider the undercoat when choosing a colour, as it can affect the end results. Another important factor to remember is that some colours neutralize others out, and a colour wheel will help you to identify which neutralizes which. If someone has brown hair with red tones that you wish to get rid of, or neutralize, the opposite colour in the colour wheel will do so. You could therefore put on a brown colour with green tones and it would eliminate (neutralize) the red. If you have orange tones, adding blue to a colour would neutralize the orange and so on. Putting blue into a colour may sound drastic, but always remember that hair colours are not like other colours. Blue in this case might just be an ash colour tinged with blue.
Source: http://www.akcesoria-kosmetyczne.pl/beauty-news/natural-colours-of-hair/
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