Greetings,
This is a little off-subject but might be of interest to some. I just found out about these stamps by accident.
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. The image reverts back to the black disc once it cools.
These stamps are really cool and I think may be a collectors item. They are forever stamps and cost the standard 49 cents. There is also a special sleeve available for 25 cents. Hopefully everyone has clear weather for the eclipse - in just one week!
73 - Tom
Tom Deeble - KA6SIP, [email protected] Mt. Diablo Amateur Radio Club Membership Chairman MDARC, PO Box 23222, Pleasant Hill, CA 94523-0222 PACIFICON - Oct 20-22, 2017, San Ramon