The dark purple formula goes above and beyond ... and she actually liked that she didn't have to use it very often to get stronger, brighter hair. Who It’s For: If you’re looking to dabble ...

So that’s the investigation: is Dua Lipa’s hair purple ... Is it still red and just the dark lighting? Is our girl tinting it to purple? Is there really that much of a difference between ...

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 ...