About 50 yrs ago, I bought 2 lbs of unknown powder from a guy who found it in his deceased uncle,s home. No markings on it. I was afraid to shoot it, so I sent a small sample in an envelope to DuPont (back then they made the IMR powders). I received a written reply stating that they would need much more and that it could only be identified by doing a "bomb test" , In this test, they put a quantity of the powder in a sealed tube containing a pressure guage, and detonate it under water. My powder became lawn fertilizer.