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A must have for blonde, grey and silver hair, we've all heard our hairdressers advise the importance of maintaining our colour with a purple shampoo. But why exactly do we need to use it, what does it do and how often should we use it?Here at AllHair.ie, we're got the answers to all of your Purple Shampoo questions, so you can sport beautiful blonde tresses without the brass!What Does Purple Shampoo Do? Purple shampoo is used to neutralize yellow and brassy tones in blonde hair. The purple pigm …