I've got ashy blonde highlights and want to buy a shampoo to keep them ash coloured rather than going brassy yellow (as has happened previously).
At the mo I use basic shampoo, Tresemme or similar, but my MIL recommended a "silver shampoo."
Ok - what is this, why is it bright purple, does it work and are there any particularly good brands I should go for?
Hair is naturally mid brown, chin length, wavy and prone to frizz...