Join Date: Sep 2008
Location: Bavaria, Germany - the center of 15th and 16th century gunmaking
Whatever that darker substance on your finger may be - it does NOT look like black powder.
As soon as I can I will reopen one of the very few! of my 30+ flasks I remember actually containing remains of that special kind of finest ungrained black powder used 700 to 400 years ago - this still being the only proof of actual usage of any flask (apart from wondering whenever that may have been)!, and post an image of MY finger ...