Temporary Colour - Large colour molecules coat the hair cuticle, Semi-Permanent Colour - Different sized colour molecules are deposited into the hair cuticle and the outer edge of the cortex, Quasi-Permanent Colour - Different sized colour molecules enter the cortex and are oxidised/expanded by oxidant/developer/peroxide., Permanent colour Stage 1 and 2 - Small molecules go into the cortex, when peroxide is added they are oxidised causing the molecule to swell and become trapped., Bleaching - This process changes the natural colour pigments to a colourless oxymelanin.,

Effects of Colour on the Hair Colour & Lighten & The Art of Colour

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