MODESTO BEE: The U.S. Postal Service’s timing couldn’t be better to release the first stamps using thermochromic ink, which changes image when exposed to the heat of a finger.
Jed Tyler, a postal supervisor in Modesto, said when he first tested the stamps – they transform from a solar eclipse image to one of the moon – his fingers were cold. But given the heat wave the area is experiencing, chilly hands are one thing most Modestans won’t be complaining about. And Tyler said that once he warmed his hands a bit, the stamps worked fine.
Tuesday’s first-of-its-kind release of an image-changing Forever stamp commemorates the upcoming Aug. 21 eclipse.
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