Purple shampoo eliminates yellow tones in blonde hair by using violet pigments to neutralize brassiness. Blue shampoo is ideal for brunettes, neutralizing orange tones for a cooler, more natural look.
Green Matters on MSN
Is purple a real color? Science says “maybe not”
Is purple a real color? Scientists think everything we've ever believed about the color purple may not be true due to the shade's wavelength.
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