In this part of the follicle the actively growing cells die and harden into what we call a hair. As the cells below continue to divide and push upwards, the hair grows upwards too, out of the skin. It now consists of a mixture of different forms of the special hair protein, keratin.
Some of these keratins contain a high level of sulphur, some much less. The sulphur plays an important part in the way the hair behaves, especially when it is given cosmetic treatments. You will find more about this later in the book.
Some of these keratins contain a high level of sulphur, some much less. The sulphur plays an important part in the way the hair behaves, especially when it is given cosmetic treatments. You will find more about this later in the book.