Doubt it. This was my wifes step sister. Normal cargo shorts and no other accelerants involved. I'm fairly convinced this is phosphorus based military propellant of some kind. Unspent rocket motors, anti missle flares, unburnt tracer charge or something like that.
The orange color tells me its white phosphorous from an artillery round. Exposed white phosporous forms an orange colored crust that cuts off air. Without air WP will not burn. Break that crust and the WP ignites. When WP burns it smells like the burning heads of kitchen matches.
For years i was the senior firing range/EOD advisor to the Saudi National Guard. A few times we saw smoking camels hauling across the desert at warp speed: They had parked on some WP, the crust broke, the WP ignited and set that long winter coat on fire. i've seen vehicle tires catch on fire from WP on the range.