Harry Potter Marauders Map Black 11Oz Heat Reveal Mug (C: 1-
From Seven20. Solemnly swear you are up to no good with this Harry Potter Marauder's Map Heat Reveal Coffee Mug! It's Magical! The mug features a solid black exterior that reveals the image when a hot beverage is added. Heat reveal works with coffee, hot chocolate, or any warm beverage (including hot Butterbeer) - no wand necessary! Ceramic. Hand-wash recommended.