i have dyed my piece (not a TL piece) a couple of times whenever it faded a bit.
i had originally bought a 1b but i'm actually closer to black. which i came to realize after first coloring it and there wasn't a distinction between my natural hair and the piece. prior to that, no matter how perfect the placement and blend area it could always be seen because of that slight color difference.
any how after this last time, i used black Vidal Sassoon and got blue highlights! my girlfriend (who knows i wear) told me.
from my research it seems as though some black dyes leave a blue ish tint even if it doesn't say blue black on the box.

so what i did was i went out and bought a box of black nice and easy, which i used before with fine results.
my question is should i just give it a few washings and hope the blue will go away or should i just re dye..
thank you to all