"Yeah, um..." Usopp frowned as he saw Gin write the items down. "I wasn't sure where to find it in here, either. I first found out how to make it out of a book, actually, when I was a kid." He'd had a lot of free time as a kid. Not so much supervision. "It takes some time to get it right. I'm not sure this is really a good place to learn how."

He rubbed the back of his head, scratching under the edge of the pirate bandanna he'd made from one of the shirts. Usopp wasn't sure he wanted to volunteer to make gunpowder for strangers, but he also wasn't sure he wanted to be responsible for directing people on how to blow off their own digits. "Why do you want to know about gunpowder? There's guys who make swords and things, too, if that's more of what you're used to using. Gunpowder can be dangerous if you aren't careful."