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thermochromic ink

US Postal Service to Unveil a Total Eclipse of the Sun Forever Stamp at the Fleet Science Center

Total Eclipse of the Sun Forever Stamp
By Nathan Young
 
On Wednesday, August 2, at 6 p.m., the U.S. Postal Service will unveil the Total Eclipse of the Sun Forever Stamp during a ceremony at the Fleet Science Center.
 
The Total Eclipse of the Sun stamp is the first U.S. stamp 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.