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Hair composition: The main component of hair is keratin, accounting for about 97%, and keratin is composed of amino acids. Each hair is composed of the cuticle, cortex, and medulla. The cuticle is the outermost layer of the hair, usually composed of 2-4 layers of scales. The cuticle is usually translucent or colorless, so it allows the natural hair color to show through. The cortex is the middle layer, accounting for 80% of the hair. Natural pigments are deposited here, and the natural hair color is presented because of it. The medulla is located in the center of the hair.
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