Unfortunately, grey hairs are the hardest to dye, no matter what method you use, even regular peroxide box dye doesn't always do it. And herbs might be temporary at best, like if you found a concentration of, say coffee, that actually affected your hair color, you would likely end up having to use it every time you washed. I think herbs can only be a tiny and temporary boost even in a henna mix, but they're fun to add. It wold be nice to mix up some hibiscus tea to make our hair red, rather than use henna that is beyond permanent! Or coffee to make hair black rather than henndigo, that would be awesome. Alas, it's not to be.
You could however make a gloss using the Lush Caca you've already got, chop up 1 brick, or even less depending on your length/thickness, add hot water to make a paste, let it rest a few hours to overnight, then add it to a conditioner and leave it on your hair for a few hours. You'll get conditioned dark hairs and possibly golden red greys! Do this on a micro-scale to do strand tests first, like a 1/4of a brick, etc.
What shade of Caca do you have?
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