The dark purple formula goes above and beyond, lathering well, rinsing easily, and leaving hair feeling clean and residue-free. And despite its vibrant color, it didn’t leave any telltale signs ...

Color-depositing shampoos add specific pigments (either purple, blue or green) onto the hair shaft to maintain your desired color. Based on color theory, blondes should use purple shampoos ...

What you really need? A purple shampoo. Yep, unlike darker brown hair colours, blonde hair has an annoying tendency to fade and become brassy. Thankfully a toning purple shampoo can help prevent this.

Sunil, who has thick and naturally black hair has recently reached ... "If you leave a purple shampoo on for too long, your hair will have a blue-purple tinge to it," Irwin cautions.