Comment on The science behind the color-changing solar eclipse U.S. postage stamps? Fat magic.

The science behind the color-changing solar eclipse U.S. postage stamps? Fat magic.

Provided by the United States Postal ServiceThe Total Eclipse of the Sun Forever stamp debuted June 20, 2017. It’s the U.S. Postal Service’s first heat-activated stamp. Using thermochromic ink from Chromatic Technologies Inc. in Colorado Springs, the stamp’s black ink spot vanishes when you press your finger on it to reveal a full moon. Put your finger on the black spot on the new U.S.

 

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