This Is A Top Colorist's No. 1 Tip To Keep Gray Hair Shiny & Bright 

Transitioning to gray is a process: Whether you blend the new color with highlights or opt for a fresh haircut to add some dimension, how you choose to embrace the silver hue is entirely up to you. Then once you've gone fairly gray, specialists do have a number of recommendations to care for the new pigment and texture. For instance, if you find your grays lacking luster, influential hairstylist Christin Brown, a curl and silvering expert, shares an expert tip to brighten the strands back to an icy platinum: Grab a purple shampoo. 

As for how often to use it? Sorry to say, there's no specific schedule to follow. Everyone's hair is different, but we recommend using it once every week or two, then building it up from there until you find your own cadence. Just know that it is possible to overdo it—especially if you have high porosity hair—which results in a (temporary!) purple tinge. "When you start using purple shampoos, you'll know when it's too much very quickly," adds Brown. But don't fret too much if you've tinted your hair lilac—Brown says after two or so washes all the extra pigment should fade, and you'll be left with a beautifully cool hue.

Yes, gray hair can turn brassy and dull—but a purple shampoo can easily brighten up the silver strands. If you're looking for ways to enhance your platinum locks, Brown would consider this one of her top tips.