A really old clip, one of the first ones I ever bought, broke in a half dozen places on the edges. So I lit both ends of it and laid it down on this piece of metal. Then I set a timer and watched it. It didn't smoke at all, and the flames were barely visible. It burned for 10-11 minutes and there was barely anything left. The ash isn't stuck to the metal either, it just fell off when I tipped it over. While it was burning, I passed my hands over it about 5" away and it was HOT. I'm going to order 200 more. I have 900 rounds of JHPs in one can, 900 rounds of M193 ball in another can, and 2 cans full of cardboard inserts, waiting to be filled. These leave less residue than ration heating fuel tabs, and that stuff sticks permanently.