Some Chem questions

In a formula for flash powder I made today, it calls for KMnO4, Al, and S. What does the S do in this reaction? All we can think of is that it either bulks it up so it doesn’t burn as fast, or that it absorbs some of the energy. It doesn’t seem to flare up.

Also, we need a binder. This is a pyrotechnic powder. However, when water is added to the KMnO4, it starts hissing violently and (we think) decomposing. Are there any ready-made binders that would work? Glycerin is definitely outta the question, as it explodes when it meets KMnO4.

Also, any ideas on fusing? We were thinking of quickmatch, but we don’t know if that would work. Got any ideas other than a hot paper clip?
Thanks!

Isn’t clay the standard binder used for such things?

I am not sure if the moisture in clay would ruin the compound though.

I think the sulfur is added as a flux to aid in breaking down the oxide coating on your aluminum powder. Dichromate, which will dissolve the oxide, works well without added sulfur. If I recall correctly, Dichromate/aluminum mixtures sometimes ignite spontaneously when they get wet, it wouldn’t surprise me to find that your mixture suffers a similar problem.

Sulfur and aluminum are both nicely flammable, while potassium permanganate is a powerful oxidizer. Pure aluminum isn’t a nice steady flame like you want.

The water is being oxidized. You have a very strong oxidizer there, and just about anything that can be oxidized will be. Ordinarily, I would suggest petrolatum, but I suspect that the permanganate will react with it as well. My best guess would be a finely powdered, very dry Kaolin or other clay. They’re usually sold online in small quantities. CAREFULLY mix it and mold it into the shape you need. Buy yourself some good fuse cord with an exact burn rate and test it before you use it.

Last, but not least, know this: you will blow off a body part at some point in these exercises. An eye, a hand, fingers, part of your face. Sooner or later. It’s a given. You’ve chosen volatile toys, and I guarantee you whatever safety precautions you’re taking are not enough. I love things that go flash and bang too, but there’s a price and you’ll pay it.

Thanks for the advice Trucido! I am using a chemistry lab for this stuff, and am using eye protection, fume hood, etc. Also, we are using such small quantities (less than 1 gram at a time) that an injuring explosion seems unlikely. Thanks for the concern. I will go down to ceramics tomorrow and pick up some dry clay and carefully work with it.