Justwakin. i have used powdered dyes on leather. I used a stiff brush to pounce the powder dyes into the leather and then use a spray sealer so that they would not come off. It makes for a very subtle color almost like water colors that have been washed or pastels. It does work ,don't get discourged. I have tried almost every thing to see if it works and i will be darned that it works almost every time.
as for smoking leather ,the Native Americans have been doing it for thousands of years. it is part of the brain tan process to water proof the clothes. they would brain tan lets say an deer skin and then they would hang it after the brain tan process inside the top of the teepee or would wrap it around a frame and smoke it . It comes out very nice . the only problem Is that when I work with brain tan I get hungery for BBQ.Don't let anyone discourge you from trying something. It might not work but at least you tried it and can now say it did not or it did work. Keep up the good work and have fun with leather. Gary