Plus a briefer on why hair goes brassy to begin with. Fact checked by Isaac Winter You drop a decent amount of cash on a dye ...

Blue shampoos replace orange undertones with cooler brown shades. We tested the market leaders in our beauty lab to find the best for brunettes. Shop now.

Color-depositing shampoos add specific pigments (either purple, blue or green ... allowing it to counteract unwanted brassiness and yellow/orange hues that can develop over time, according ...

most blonde shampoos contain blue or purple pigments that give them their namesake colours. When you use them, they deposit these clever colour enhancing pigments and cancel out any warm, brassy ...

Except when brassy tones creep in and ruin ... "If you leave a purple shampoo on for too long, your hair will have a blue-purple tinge to it," Irwin cautions. Never exceed the specific product ...