Set the hot plate temperature to medium-high, and about every 30 seconds or so, stir the mixture well, being sure to scrape the material that may start sticking to the bottom.

 
 

Over the next several minutes, the mixture will begin to darken and clump. It will soon begin to look like brown sugar, and when it finally mixes smoothly and looks like peanut butter, it is done. If you mixture is turning BLACK, you're heating it a too high of a temperature.

 

Remove the container from the heat, and scoop out a lump of the sticky mass. You can either just plop some on the concrete, or if you're picky about the way your smoke bombs look, you can make small cardboard molds and press the gooey mass into them. Personally, we just lay it on the concrete.

Before the little blob cools, insert a small piece of Visco Safety Fuse.

Do this to the remainder of the material and allow them to cool and harden.

In about 5 minutes, the material will be cool and become rock hard ( beware that it will stick to the surface while cooling, but is easily removed with a little knock from a hammer. ) Set your Smoke Bomb away from any flammable materials, light the fuse and stand back.

The smoke from this mixture is essentially non-toxic, but that doesn't mean you should stand in a cloud of it and breathe it all day long. Like any smoke from burning material, people may be allergic to it, or is my cause eye  irritation in some more sensitive folks.

Los Alamos physicist Bob Lazar, formed the company United Nuclear in 1986, due to his realization that schools had stripped science of its fun by removing actual hands-on-experiments in favor of dry computer simulations. As such, United Nuclear started selling a variety of experimental chemicals for hobbyists and professionals alike. One of the larger contingents of their customers are pyrotechnicians, who can find all the things they need for advanced pyrotechnics and fireworks at United Nuclear's site.In fact, for 13 years, Bob and United Nuclear hosted the highly prestigious (and exclusive) pyrotechnics extravaganza, Desert Blast. He's currently working on building a better hydrogen fuel system for automobiles.

(Article reprinted with permission from United Nuclear.)