Faulty Product

This mug looks super cute in the pictures. I ordered one as a Christmas gift and the product arrived in a few days. After the gift was opened she tried it out by hand washing and then filling with Hot Chocolate. Nothing happened. No change in color at all occurred. I filled out a return and then ordered a replacement mug. Shipping was quick. The 2nd mug also does not change color at all. I even held it under hot running water. This product is faulty.

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