well as making them more susceptible to mechanical damage. Reaction of chlorine with keratin results in creation of water-soluble chemicals and weakens chemical bonds between fibers forming hair shafts. Also chlorine can get between the hair fibers. As the crystallization process develops inside the hair, the chlorine crystals can separate the hair salt crystallization process may also affect the hair cuticle. The cuticle is an outer layer of very hard, dead cells over the hair surface. If the chlorine gets between the scales it could push up the scales; therefore, making it rough. These flaked cuticles reflect light poorly and so the hair fiber looks dull, dry and may feel rough when touched. Chlorine can change electrical charge of minerals bonded to hair and oxidize those minerals.