All Complex Things Are Simple

Exploration Stage: Historical Museum
From: Mr. Black
Description: You’ve heard about the Hound of the Baskervilles, which glowed brightly because of phosphorus. What if it’s the same with the prints found in the museum? If so, there must be a can of phosphorus around here somewhere. Please find it.
Completed: You found a can of phosphorus - thank you! Apparently, Paul Watcher stepped on spilled paint in the storage room during the day and didn’t notice the glow. And when he was making rounds, he found the boot prints that he himself left.