thanks for your idea. Coincidentally I shoot black powder. The bottle contents were chunky and perhaps crystallized, almost metallic. Interesting thought, though.
Thanks in advance!
I’m not sure the pictures tell the story, but the bottom has a K inside a shape (keystone/Knox?) and the number on the right looks like 1368.
The aggregate inside is noisy when shook.
I can barely make out a couple of letters on the screwcap. I’ve not tried to remove the...