Actually, fireworks use black powder, but I get your point. If the front pages were saying he bought black powder used for muzzle loaders from a gun shop all of us reloaders would be in trouble.
I notice a lot of posts referencing Black Powder, or White Powder. I find that racially offensive. Can't we just refer to it as "Da Powder", or the "Bang Juice"? Or maybe the "United Colors of Powder"?