Supernatural Heat Change Mug
The perfect Gift for your potty-mouthed friends!
This is a heat changing mug that reveals a naughty message once a hot drink is poured into it and, it then returns to an inconspicuous black once the mug cools down.
Brilliant quality (slow colour transformation).
Do not put in dishwasher – handwash only
Note: This is only one mug, not three.