Ok, I'm going to experiment with Henna and Indigo for my hair dye. I have very dark brown hair naturally, but I've found that black tends to make it seem fuller. The nice thing about henna is that it is gloopy enough to do your eyebrows too. I've got past shoulder length hair, but of course not tranisitioning until my mid-thirties it is thinner that a cis-woman's. So I'm going to start with 200g of Henna. From here out I ought to be able to just hit the roots and be done, but for now I've got to make sure it is all the same shade. Because I'm in a hurry instead of letting it sit overnight at room temp, I'm going to put it in the oven on bread proofer for 2+ hours since according to my instructions that is ok too. After the henna releases its colors because of the acid in the lemon juice I'll apply it and cover it with plastic wrap for 2 hours. Then I rinse it out and mix up the indigo to cover that. The henna should give me a deep auburn, and then the blue indigo will make it a black color.
Here goes, I hope it turns out ok.