While a hydrating shampoo is pretty much always a good idea, this anti-brass purple shampoo is perfect for icy-blonde hair maintenance. Its formula is engineered to counter the yellow undertones that ...

John Frieda Violet Crush Purple Shampoo Formula: Creamy | Best for: Color-treated hair | Scent: Citrus notes | Recommended use: Daily | Sulfate-free? No “This stuff is like magic!” an Amazon ...

As the name suggests, purple shampoo uses violet pigments to tone and neutralize hair, allowing it to counteract unwanted brassiness and yellow/orange hues that can develop over time, according to ...