Eric tried to rummage through his memory, explaining to Joseph what he knew about the rudimentary formula for gunpowder:
"Saltpeter soil can be found around old latrines. Mixing it with plant ash can refine potassium nitrate. Charcoal is just the black rock we use to fuel the forge. As for sulfur, it's a type of yellow mineral with a distinct rotten egg smell. Find all three, and we can start experimenting."
He frowned slightly, trying to recall more details: "Sulfur often appears near hot springs, volcanoes, or next to geysers. It probably won't be too hard to find."
"Rotten egg mineral... black rock... and saltpeter soil..."
Joseph muttered as if in a daze. The fire in his eyes seemed even hotter than the forge. Suddenly, he slammed his hand on the table, shot up, and rushed outside.
"Hot springs and volcanoes have sulfur, right? I remember now! There's a volcano we used to mine minerals at! I'm going right now!"
