I try to only reach for this once a week or during every other wash, as over-use of any purple or silver shampoo can cause build-up, which ends up dulling strands. I tend to apply it to my 'money ...

"A natural brunette can use a blue shampoo even if their hair isn't [dyed ... Your hands will not only be left with an alien-esque purple-blue tint, but the color will also linger around ...