Chemical colouring opens the hair cuticle (the tough outer coating of the hair made up of overlapping scales), then penetrates inside the hair, thus modifying its natural structure. This is why we often find that hair becomes porous when treated with chemical colour. On the other hand, plant based colour doesn’t modify the hair at all, it only coats the hair. It brings colour to the hair along with protection and shine. In addition, the natural structure of the hair is never altered.
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