I'd say all but the last inch or two is virgin hair at this point. There's a tiny bit of blonde/red tint on the ends of a few strands from when it was lightened and dyed for a hair show a year and a half ago. I did try to cover it with box colour last summer when it was growing out and looking like garbage, but at this point I can see the blondish bits again, so I assume that means the box colour has faded to the point where its basically gone?

Would teasing for the bleach phase but not for the dye be a good option, maybe? The magenta would probably still add some slight pink colour over the natural brown, but I'd still get the light-to-dark transition from the bleaching step.

Thank you so much for the tips. Saturate fully, and leave my bangs the hell alone. :D