How Do I Know If I Need Blue Or Purple Shampoo?
You should use blue or purple shampoo if you have blonde, silver, gray, or white hair. Blue shampoo cancels out brassy tones in blonde hair, while purple shampoo neutralizes yellow tones in blonde, silver, gray, or white hair. It is recommended to use these shampoos once a week or as needed to maintain the desired color tone of your hair.