How can I get temporary black dye out of hair?
Back in December I dyed my hair with Natural Instincts temporary dye (28 washes) and it still has not come out as much as I wash. I have used this brand before with other colors and they tend to wash out after a month or so, but the black has not faded at all.
Any suggestions?

It stained your hair. Most black hair dyes do that. You won’t be able to get it out. you will have to go to a salon and get it dyed or something to get the color you want.