What is a good long lasting violet hair color or dye?

i would go to a beauty supply store you might only find manic panic or if your lucky u will find another brand, but it's very important with colored hair to use shampoo for people with dyed hair. Even if your hair is dyed a regular color it will still fade. i dont know if you are or not but i hope this somehow helps, also i would only wash it every few days not only will it hold color better but it's not good to wash your hair every day. it washes out your natural oils :)