Harry Potter Mugs heat changing color, Harry Potter Mugs are ceramic mugs featuring photographic quality art form your favorite movies. These mugs are black at room temperature but when heated, as with a hot beverage, the artwork is revealed and they display vibrantly printed title-themed artwork.

Product Features

• Color changing, heat-sensitive ceramic mug
• Heat-activation reveals hidden image
• 11oz in size
• Material: Ceramics

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