In The Witches by Roald Dahl, the Grand High Witch tells the witches of England how to make a potion called Formula 86 Delayed Action Mouse Maker:
Formula 86: My greatest triumph. A work of... genius. Formula 86! In this bottle, 500 doses, with a delay mechanism that prevents it from working until two hours after it has been taken.
One dose, and the time works to the second. But more than five doses breaks the delay barrier, and the formula works instantly. Child...starts to shrink. The child...starts to...grow fur. Starts...growing a tail! All this happens in precisely twenty-five seconds! Shrinking more...child is no longer a child.
Child...is a MOUSE!
- Size: 1.5"
- Material: Silver Metal
- Post: Double, rubber clasps
- Special Features: Custom back stamp