I've recently decided to delve into leatherworking as a means of repairing and maintaining some of my reenacting gear. My skill level is best described as rudimentary, and that said I'm slightly stumped with my current issue. I recently ordered a pair of old Swiss mountain boots (leather of course) and upon arrival noticed that the leather was becoming rather rigid and dry, so naturally I went and applied a coating of mink oil. After chatting with a few of the other guys that are in my reenacting unit, I found out most of them are dyeing their boots black. So I went to the local crafting store and picked up some Fiebings black dye and tested a coat on my older jackboots, and tested a small portion of the mountain boots. The jackboots were success, whereas the mountain boots not so much. The dye beaded up and didn't appear to set in.
My question: Is there an oil based dye that will penetrate the layer of mink oil, like Fiebings Professional Oil dye? If not, would you have any suggestions for improving my odds at dyeing the boots?