Before i ho for it one last check, if i mix adore violet gem with either directions violrt or neon blue to waht ratio would give me a cadbury purple?? At the mo im only doing the ends a sort of ombre over a gingerish base, also could i do it tonight put plastic sandwich bags around them with bobbles to tie them and put it all up in a showe cap and a towel around them and leave over night ??
Mix up a tiny amount to get the colour you fancy and strand test it. The colour you get after 15 mins on a strand will be pretty close to the final result.
Yes, you can leave it on all night as described.