need a stubborn blue/turquoise !

If you want really long lasting, the new formula of Direction Turquoise is kinda indestructible. Dilute it with conditioner and you get a lovely turquoise, though it does fade green so you'd want to add some more blue.

I can vouch for directions turquoise. I've been trying to get the damn stuff out of my hair since Christmas lol

Yeah if you truly want to commit to blue, Directions Turquoise is the place to go. I dyed my hair turquoise in February 2013 and it's STILL in the ends of my hair (be it in a faded greenish colour because my base wasn't light enough, but there nevertheless)

'Will be going directions turquoise then, great ! Thanks all x

Remember the new formula - it fades really green towards the end though and I couldn't move that weird swamp mint shade away, my base was very pale and regardless it becomes green (as opposed tot he previous formula which would fade into a wonderful silvery blue for me towards the very end).