Solar Eclipse Postage Stamps Change With The Touch Of Your Finger!

The new “Total Eclipse of the Sun” U.S. postage stamps designed by Antonio Alcalá, and using real photos from a former Astrophysicist, are the very first to use Thermochromic ink, which reacts to the heat of your touch. Placing your finger over the black disc on the stamp causes the ink to change from black to clear to reveal an underlying image of the moon. (more…)

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