Fatal vapor

Exploration Stage: Antique Store
From: Alford Stone
Description: In fact, I have a potion that will take away the evil ones' magical powers. Let's try that on those who call themselves filmmakers. I've been going through some old books on witches and I saw a recipe for a potion that would break the spell...it could be any of the books in there. Can you help me find it?
Completed: I guess they found the potion to break the spell! I thought I hid it pretty well, but... well, the witches must not have even known I had this recipe. The witches would have collapsed and lost their powers just by inhaling the vapors of this potion. What the hell? Still standing? Let's wait a little longer.