Oh my you got to love this! It is simply awesome. Now, you must be wondering how does this works? Here you go: At plain sight it is a standard black mug as they come a dime a dozen and in big white letters it say OFF. Nothing fancy, but once you add the hot beverage of your choice, the mug changes color and is turning white and in big black letters it states: ON
On/off mug by Charles & Marie.
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Fantastic. Whatever will they think of next? As smart as this invention is, I’m more curious to know how this happens? How they created it? Is this similar to how toy rings (those that come in cereals) can change colors depending on the weather? Or something like that… And what is the mug made of? Porcelain?