I would think beet juice powder since you can concentrate it. You cant take the water out of fresh beet juice without alot of time in the dehydtrator and then all youve done is make your own powder. So less water = more pigment at least in theory lol
You think it would help if you did something to lift the cuticle first like poo bar - acid/conditioner? I had better luck with tea staining when i shampooed, misted it on, waited, then get back in to wet and condition. I figure if my SIL did it with developer which is basically a harsher version of the same priocess right?
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