For someone with a warmer grey or blonde tone, 1-2 times a week is sufficient. To use a purple shampoo, wet the hair and lather on the formula. Purple Shampoo For Dry, Fragile Hair. This paraben-free formula uses natural balancing extracts that encourage volume, and discourage frizz. The hair can often become dry and damaged and reveal the underlying pigments which are warmer and more yellow/orange in hue. For someone with white hair or icy blonde tones, you can use the purple shampoo every time you wash your hair. The way it works is all down to the science of the colour wheel. While silver and purple shampoo are designed to cleanse hair like a regular shampoo (but with added colour correction), purple toner is a colouring treatment specifically designed to restore tone imbalances. Purple shampoo is a lifesaver in upkeeping blonde hair. When used several times a week, this shampoo can keep your hair cool all on its own. Purple shampoos cancel out yellow, orange, and brassy tones in your hair to keep it looking bright and fresh. It prevents you from having to use ammonia toners regularly, which can be damaging to your locks. The finished effect depends on how long the toner is left on the hair: from subtly neutralised tones to completely revitalised and refreshed blond/grey/white hair. Of course, some people will like this tone, however, if you don’t, purple shampoo on brunette hair can be your saviour to take out any unwanted warm tones in your hair. "Don’t apply it on dry because the hair is more porous and it will grab too much of the purple … If you start to see an overwhelming amount of brassiness coming through again, it may be time to do a full tone—and you can learn how to do that When using the best purple shampoo that suits your hair, lather a generous squeeze into wet hair as you usually would. If you’re concerned about regularly using a purple shampoo as you’re a sufferer of frizz, dryness, and lack of volume, you should give Winsome & Wisdom’s #BlondeMoment purple shampoo a go. Here are the 23 best, from Nexxus to Oribe.