There are some pictures at the related links below.
It just looks like a barrel with black flakes coming out of the top off the barrel.
Try the on line auctions like auction arms and gun broker, there are pictures of them there. You may have to look in the archives, but there are several pictures of many models.
We're not sure, but the Western Zhou dynasty looks like the best bet. There are few records from the time, about the mid 9th century.
They smell like acid and gun powder.
Copper.
Black Powder.
Gun powder is always a mixture.
this automatic gun looks like..........your face! why would you ask me????????
gun powder was udes for fireworks, then weapons
Gun Powder is the most important thing in a war because if you don't have gun powder you wouldn't stand a chance.
No way to post pictures here. damascus is made by bending and hammering iron over a mandrel. looks wavy.
Trade goods like gun and gun powder, spices, and perfume and sugar. and salt.