Blonde hair toner shampoo11/21/2023 You hear about oxidation in skin-care ingredients such as vitamin C, where clear formulas can morph into a brownish red hue when exposed to environmental aggressors. At a microscopic level, hair color molecules can lose an electron, which causes them to undergo a chemical reaction. Oxidation is one of the main reasons that hair turns brassy. In general, these formulas have chemicals that keep hair color from oxidizing, by avoiding the warmth of the base to come through." "However, there is purple shampoo that's made specifically for blonde hair that prevents the color from getting brassy. The science behind the purple shampoo will unsurprisingly take you all the way back to art class: Purple opposes yellow and orange on the color wheel, so when it's incorporated into the hair, it helps to neutralize those colors so that hair doesn't come off as brassy. "A purple shampoo is good for people who get double processed platinum hair," says Rivera, who's more skeptical about the effects for single-process blondes and brunettes.
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