Hair is composed chiefly of a protein called keratin which is present in all horny growths such as the fingernails. The chemical composition of hair is carbon (50.65%), hydrogen (6.36%), nitrogen (17.14), sulphur (5.0%) and oxygen (20.85%).
The chemical composition of hair varies according to the color of the hair. Dark hair has the most carbon with less amounts of oxygen and sulphur. Light hair contains less carbon and hydrogen but more oxygen and sulphur.
Daily Hair Tip
In a Clairol Professional survey 33% of the respondents reported that they preferred to have their hair colored in a salon rather than risk doing damage at home. 50% of the participants said they liked their colorists best because of friendliness while only 38% valued good advice about haircolor or the fact that the colorist kept up on the latest trends.