It all comes down to the color wheel. Purple shampoo eliminates yellow tones in blonde hair by using violet pigments to neutralize brassiness. Blue shampoo is ideal for brunettes, neutralizing orange ...

You’ve heard of purple toning shampoo for blonde hair but did you not that there’s a version for brunette hair? Blue toning shampoo is formulated to treat brassy tones in color-treated brunette hair.

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Like all hair colors, brunettes can experience fading, brassiness, and an overall lack of vibrancy.