I just want to ask which colour is the best for blue hair. Now Im violet, but want to be blue

Any Manic Panic Blue Is Good If You Don't Mind Re-Applying It As It Fades.. I Used Atomic Turquiose Yesterday ^_^
It Depends On The Length Of Your Hair, Mine's Shortish So A Pot Lasts A Few Dyes.

Or Special Effects Are Good.

But I've Never Seen Any Permanent Bright Coloured Dyes For Sale.

i'm an italian boy but i can help you for crazy color you can look to the stargazer products!! are pure color like green pink blu violet but you must to highlights your hair. with this color your hair will be really blu, if you want a natural black blu you can use the koleston of wella whit the blu corrector ( 22/00 + /88) good by and sorry for my terrible english