It's in the Water II

I think we're onto something here. After some thorough testing, I'm almost positive i know what's been hiding in Ban Pa. I only need the last piece of the puzzle, and I would appreciate your help finding it.

Please return to Ban Pa and investigate anything unusual. This includes anything seemingly out of place in a fishing village, even given it's supposed haunted and cult-run reputation. Pay particular attention to anything related to chemistry. If my hunch is correct, all this time, we haven't been dealing with anything supernatural or out of this world but a classic case of human greed and stupidity

• Search Ban Pa and find anything related to chemical production