Whats the best shampoo for colored hair?

I recently had my hair dyed blue/ black but i can't really see the blue.. so it mostly looks really black.. is there a shampoo or hair product that will bring out the blue better?





thanks!Whats the best shampoo for colored hair?
Any name-brand shampoo that specifically says ';for color-treated hair'; would be fine. I like Pantene.





Although I'm not sure about its ability to ';bring out the blue better.';