Fiebing's Oil base leather dye. It has stained everything I ever used it on and several things I didn't intend to use it on. Like a carpet one time and quite a few shirts and pairs of pants.
I recently built an antique style knife and used stag horn for the handle and wanted to dye the white where I worked the horn so it would look old. Wood stains did nothing. Fiebing's did the job.
