With that being said, I also just plain missed my regular medium brown hair (and wanted to be able to play around with my Hair Secrets extensions in this color again! They're actually an awesome way to tell when I'm getting close to my regular hair color haha.). So here are the experiments I carried out to get myself back as close to my natural hair color as possible.
Test #1 :
Recipe: About equal parts honey, lemon juice, olive oil heated, and cheap conditioner applied to entire hair, wrapped in saran wrap and let sit for 30 min. Washed out 2x with daily clarifying shampoo and 1x regular shampoo with sulfates, then conditioned.
Results: This actually worked pretty well on the roots that had been dyed just a couple weeks back. I bet it would work awesome if you had only done your hair once or twice, but the lengths of my hair have been dyed over a handful of times so I knew that would be harder to remove. Noticed the slightest change in the rest of my hair to have more of an overall brown look as opposed to the blueish burgundy of the black.
Recipe: 2 parts coconut oil to 1 part conditioner, 1 Tbsp lemon juice, 1 Tbsp honey, 4 vitamin c tabs crushed. Did not cover the hair, left in 45 minutes. Washed out 3x with regular shampoo with sulfates, then conditioned.
Results: I am starting to see the natural red-brown tones coming out, although the hair is overall still pretty dark.
John Frieda Brilliant Brunette Visibly Brighter In-Shower Treatment and John Frieda Brilliant Brunette Multi Tone Revealing Shampoo & Conditioner
Results: I took before and after pics, so it really helps to see the difference. You can definitely tell a difference. It took my hair from essentially black to noticeably brown. It's still a super dark brown, but you can at least see that there's the warmth of the brown tones. I think it lightened up my roots a little more too. This is recommended for use once a month, so if my hair is still awfully dark in a month, I might try it again.
I know I'm not back to my natural hair just yet, but with time I have confidence I will get it back over time. I'm just glad I'm back in the brunette spectrum. I was just getting tired of the black.
I hope this was helpful!