When hot liquid is added to the mug, the dark areas clear. On the right side of the mug it shows a patchwork design that says "I'm a Catch" and on left side the heraldic shape shows animals which represent the four houses of Hogwarts: A Lion (Griffindore), a Serpent (Slytherin), a Badger (Hufflepuff) and an Eagle (Ravenclaw.)
The mug is brand new, and still has it's original tags.
THERMOCHROMIC: 1 Color
TYPE: Retail