WGN-TV |
USPS issues color-changing solar eclipse stamps
WGN-TV It seems everyone is preparing for the Great American Eclipse of 2017, even the U.S. Postal Service, which is now selling limited-edition, color-changing solar eclipse stamps! The first-ever, heat-activated stamp uses thermochromic ink that is … Solar eclipse 2017: How to get eclipse stamp that changes when you touch it Solar eclipse stamp uses color-changing ink and is available at the post office now Total Solar Eclipse Survival Guide |
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