As long as the liquid is hot, the photo on the mug will reveal itself. The print done on personalized magic mugs is permanent. It will never fade off. You can rub the image on the mug thousands of times but it will still be there on the mug.
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Although this product is top-rack dishwasher safe, hand washing is recommended to ensure that all parts of the product are thoroughly cleaned. For maximum thermal efficiency, preheat or pre-chill the product just prior to use. Fill with hot/cold tap water, attach lid, let stand 5 to 10 minutes, and empty water.
Wondermugs® is the brand name of an exciting new line of color-changing coffee mugs that change dramatically when a hot beverage is added. Utilizing stunning graphics, often featuring work by name artists, they make drinking coffee, tea, hot chocolate or soup a whole new experience!