Why does blonde hair go brassy?

Blonde hair can go brassy when bleaching does not remove all of the underlying pigments in the hair. The underlying pigments that remain after colouring/lightening hair are yellow, orange, and red in colour. As the cool pigments (toners or hair colour) fade, the warm underlying pigments that are left behind after colouring can become visible, causing a brassy appearance. Using this mask will knock out the unwanted brassiness.

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