How do magic mugs work? What is used for the heat sensitive coating? - Quora
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By A Mystery Man Writer
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4.5(387)
Product Description
Answer (1 of 2): Sometimes we want things to change color as they get hotter or colder just for novelty or entertainment—and we don't need anything as sophisticated as a TLC for that. You've probably seen those coffee cups with hidden messages or pictures that suddenly appear, like magic, as you