I've used this on a couple of friends. On one of my friends hair, it was over faded permanent red and it lasted amazingly and faded brown. On my other friend, i used it over bleached orangey yellow hair and it eventually faded a dark green. However, having it all over my nail and such, i think this dye would fade blue on hair that is bleached very light - so think about base colour before using this, as you'll be stuck with it a while! It starts off black as black gets and very shiny, nice coverage without much dye. Really can't complain about it at all :)