I have been highlighting my hair for about 3 years now. My hair stylist recommended the oligo blue shampoo and conditioner after I mentioned that my previous stylist told me to use purple shampoo. The purple shampoo never really got rid of the brass in my hair so I needed to find something that actually worked. The first time I tried this shampoo I was amazed at how well it worked. My natural hair color is dark brown but I have a full head of icy blonde highlights. I use this every other week and each time I use it it gets rid of any brass and makes my highlights super bright again. It works amazing and really helps my highlights continue to look fresh in between appointments.