Review on 🎅 Unveiling the National Treasure: Color Changing Christmas Coffee Mug for Men - 11 Ounces by Shalom Germann

Not sure if I received a mug that was in a hot/cold environment for a while before shipping but it is not working. The first image is as clear as can be, but it's also because I'm holding it in front of a window so it gets some more light. I started with hot tap water, then gradually tried hotter liquids and even poured hot water on the outside of the cup. It was definitely a disappointment, especially after such positive feedback and results from other buyers. Although the mug is of good quality. I just want it to work - it was the perfect Valentine's Day prank gift.