I recently dyed some leather pieces for a dice bag using Fiebings brand leather dye. I dyed the leather and let it set for hours to let it dry, but when I run my hand over the leather piece, I still get dye on my hands. How do you fix this problem? I should mention that the dye that I am using is purple, and I have been buffing the dyed leather piece but the dye still stains my skin.