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Hair is made up of three layers. The first is the outside layer, the cuticle, it is colourless and it is the protective layer of the hair. It lets chemicals such as shampoo and water in and out of the hair. Then under the cuticle you have the cortex. This is where colour is made and deposited. The inner most part of the hair is the medulla. It is only found in coarse hair and it has no real purpose.

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16y ago

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