Manic Panic Raven

It's should go back to black again.

One thing I've thought about with green based blacks, is the possibility of adding some red to neutralise the  green. This might help with minimising the green fade.

If you'd prefer more of a blue fade, Adore's blue black is a nice deep black when it's fresh, and fades more blue than green, although I don't let mine fade down much, so I don't know what the eventual fade is like, and I don't use it over a pale base, my base is dark to begin with, so I can't really say what it would be like over blonde.

I found blueblack doesnt take well on  a very blonde base. I put it on a few days ago and it came out more silver grey. I think my light yellow hair took up the blue as a toner. Had to redye it the next day and it still didnt come out as dark as on my boyfriends ginger base.

Thank for the replies!
I did it so here's finding out lol.
If it doesn't go all black next time I dye it, I will definitely try adding a bit of red to see if it tones the green. Then do a more blue black.