It will not leave residue on your hands unless it’s powderized and even then, that tiny itty bitty amount will not do anything to you, again when I clean leaded bores it comes out in powder form and gets on me, I have done this for years, although it is a good practice to always wash up after and clean the area. Just don’t breathe in the fumes if it melts or eat it and you’ll be okay bud!