There are various forms of gunpowder. Black powder can be clumpy or powdery, ranging from black to light gray depending on the actual mixture.
See the related links below for some views of gunpowder.
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The gunpowder was stored in places like the Tower of London.
Sulfur
I guess gunpowder is useful but only in wars but wars aren't exactly a good thing. It can also be used for celebrations like fire works
instead of bullets they had gunpowder.
check this sight http://en.wikipedia.org/wiki/Gunpowder