hinkley parent
Don't let your rust and aluminum filings mix too well either. It's bad.
OK, this has gotten silly.
Almost ANY small particle in a light-density air suspension (dust cloud) will ignite. Certainly anything that oxidizes is prone to going WHOOF! around flames.
This includes non-dairy creamers, paint spray, insecticide sprays (canned or pumped), and sawdust tossed over a fire.