This product is basically Jesus in a jar. I mean it makes your hair feel like a million bucks but it also works! What the silver/purple formula does is tone out any unwanted brassiness in the hair while giving your hair a deep moisture treatment. As someone who is blonde I've always struggled with finding the perfect product to keep my blonde icey. The jar says to leave on for 5-8 minutes but I always suggest to my clients to leave on for 10 minutes or more on towel dried hair. Also great for grey hair and hair that had been over exposed to sun! So slap it on whenever your hair is looking dull or brassy and let the magic of Davines Alchemic Conditioner transform you.