Ever wondered which to use? A blue or purple shampoo?

Both shampoos are designed to help with brassy tones. Brassy tones, whether you are blonde or brunette, you will experience when you colour your hair and that colour treatment begins to fade after weeks of shampooing, sun exposure etc.

To know which one is for you, consider the colour wheel. 

Purple is opposite to yellow on the colour wheel. Yellow tones appear in blonde hair in the weeks after bleaching treatments. So if you have blonde hair (or platinum, grey, white) you can use purple shampoo to neutralise those brassy tones and leave your hair brilliantly bright blonde again!

Blue is opposite to warmer brassy tones like orange and red on the colour wheel. Warm orange and red tones appear in brunette hair as colour begins to fade away. So, if you have brunette hair you can use blue shampoo to restore your vibrant salon fresh colour. While purple toning is mainly for blonde hair, blue toning is designed to work for both brunettes AND warm blondes, meaning it works on warm highlights and balayage too.