The last dyeing I did, on a powder horn throat and a hunting frock, was done with potassium permanganate. I can't give you any proportions for mixing as I just winged it. The liquid mixture will look like grape juice, but will turn whatever is put in it very brown, how brown depending on the mixture. Use some test pieces. Biggest PITA is getting the cloth rinsed out after it is dyed. As a point of interest, did you know a gallon of the mixture, rinsed from cloth, will turn an entire 6 foot wide stream purple for a distance of 100 yards downstream? At least, that's what I read somewhere. :redface: