Natural Instincts is actually a DEMI permanent, because youre using a low level developer, so it will penetrate the hair as opposed to just sitting on top of it. And yes, black is a ****** to remove. From what I've seen in the past, since the black is not your natural color, it will take several steps to remove the black, and then to get it to blonde, your hair will have to go through several different color levels to get to blonde (red, orange, yellow) and even after that, you may need a toner to get it to a nice, neutral blonde because the end result may initially be too yellow/warm.