Why are the Plantur 39 Colour Silver products violet?

Yellow and violet are complementary colours in colour theory as they are opposite each other in the colour wheel. One property of complementary colours is that they can cancel each other out if they are mixed with each other as they will always give a neutral grey. The violet colour pigments in the Plantur 39 Colour Silver products are therefore necessary to take the yellow hue out of the hair and make it look silvery and shiny again.

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