THIS IS WHY YOUR PURPLE SHAMPOO ISN’T WORKING 1. Purple shampoo only works on levels 8 .If you are not blonde enough, your purple shampoo will not tone correctly. 2. Purple shampoos are different in their color make up. Some are more blue, some are more violet, some are lighter, and some are darker. You need to talk to your stylist about which one is best for your hair. 3. If your hair is too porous, purple shampoo, will have a hard time staying. In this case, you may want to consider a purple c