[Snake]

That'd be nice, yeah. But instead of Sulfur, you can just use Nerif's Blood. Also, the conversion rates should be a bit unfair, like making it be a LV6 Recipe for Alchemy and cost 50 Wood/Ore per. If Gunpowder becomes too easy to craft, bombs will blow the balance out of the water (heh!).

The main risk is how this could benefit Spellthiefs and Engineers, allowing them to maintain a permanent, annoying-to-counter 230 Evade and repeatedly unleash an area attack that can deal up to 100 damage, through the spam use of (Smoke) Bombs.