So, I'm not sure if you're still compiling results, but I tried this yesterday. I think I did it correctly, but here's my exact route:
Originally, my hair was dyed black with conventional dye, two layers. Underneath that was red and the crown had black ends (hence why I dyed it black).
Added coconut oil (unrefined, virgin). I added enough that my hair was slick. I then covered it with a bag and left it for sixty minutes, then left 30v bleach powder and developer and left it in for 45 minutes. It all went to a dark reddish brown, except for my roots, which went a pale ginger and the ends on my crown, which stayed black. So, I added more oil and processed the dark bits for another 15 minutes using the same process. After this, I COed with a protein-rich, 'cone free conditioner and added argan oil.
If there is any damage, it's extremely minimal and not immediately evident, but honestly, it feels exactly the same as it did before. What I can say is that it doesn't in any way feel like it normally does when it's bleached. It does feel marginally dryer than it did before, but I also used henna after all this, and that tends to usually dry my hair out, and my results are more consistent with fresh henna than peroxide damage.
Result (TLDR version): Little to no damage.
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