A good an expensive purple shampoo!

This is a great purple shampoo that isn't as expensive as some others on the market. While Shimmer Lights is probably the best well known, if you leave that one in too long it can turn your hair purple. This Luseta one is a bit more gentle so you don't have to worry about that, and it really does help eliminate yellow tones in blonde hair to give you a more ashy/white look. It does have a very strong fragrance though so if you're sensitive to that, this wont be great for you.