Martin wrote: > It probably was the real stuff, just not contained (you were smart > enough not to do that.) We tried with simple things like cardboard tubes, but didn't dare metal pipes. > I tried to make these when I was in middle/high school: > That sounds like the same recipe for the smoke bombs we made. The one that overran the fume hood in the chem lab was a frozen concentrated orange juice cardboard can full of it. One difference is that we melted the stuff. That made forming it easy, and it hardened nicely after cooling. It's not that easy to ignite, and doesn't go boom when it does. We did it outside using a camp stove. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist