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Colour Guide: When to Use 10, 20, 30 or 40 Volume Developer

Tuesday, 14 September 2021
Developer is, quite simply, hydrogen peroxide. Different companies will include different additives but at a base level the hydrogen peroxides job is to lift the cuticle layer of the hair. The stronger the developer the more the cuticle opens and the more lightening of natural pigment it has.

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