Cordite.
Read Forsythe's Day of the Jackel for an interesting "get out of work" application.
This is great! Reminds me of the "give the guy a fish & he's fed for a day, but teach him to fish ...
"
BTW, used to be able to scrape the red off of old-style playing cards as they were a nitrocellulose mixture - supposedly could improvise a "powder mixture" for some things that go bang. (Have no idea why I mentioned that.)
Damn, Coin. I can see you hookin' up your bullet puller to your toothpaste tube next.
It's a nifty enough device but it does have limited applications.
Leave the cat alone!