Osmo's sulphate-free silverising shampoo and conditioner has a deep purple colour and a gentle formula which helps neutralise yellow tones in blonde hair while cleansing and conditioning without stripping colour.

The Silverising Duo twin pack features a 1-litre bottle of Silverising shampoo and a litre of the matching conditioner and is fantastic value, coming in around 25% cheaper than the cost of buying both separately. Of course, at that price it's not only great for your salon, but makes a profitable retail product too.