This is encouraging. I don't think Color B4 is quite the same formula as Colorfix, so it may not re-oxidise.
I loved henndigo - I got a gorgeous dark brown at first, but it basically got darker and darker until it was black, give or take, and I had to cut it off. I did switch to roots only, but that didn't help much.
It would be nice to be able to remove a significant amount of henndigo when these issues occur.
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