The stargazer blue black at the back of my head did fade because of the colour remover, so it's not all the blues. This cc sky blue, (old) directions turquoise and stargazer royal blue all stayed a long time on my hair.
Heh, all that said when I actually try to force-fade Pravana Violet, it's coming out rather easily. I am now purple-lilac-ashy (with brown roots).