COLORADO SPRINGS, Colo. – A Colorado company is behind a clever color-changing postage stamp that commemorates next week’s total solar eclipse. Chromatic Technologies Inc. in Colorado Springs created ...
Getting your Trinity Audio player ready... Provided by the United States Postal Service The Total Eclipse of the Sun Forever stamp debuted June 20, 2017. It's the U.S. Postal Service's first ...
The stamp uses thermochromic ink, which causes it to change when you touch it. The image changes from a total solar eclipse, to a picture of the moon, and back again once it cools. The United States ...
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