I'll put my 2 cents in. I have a brown Don Hume holster that I dyed black using KIWI leather dye. I cleaned the holster well using denatured alcohol with a scotch brite pad. It only took about 3 coats to get a real good black finish. After it dried overnight, I gave it a good coat of black paste shoe polish. I haven't had any problem with dye rubbing off.
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