Solar Eclipse on a Postage Stamp...
The United States Postal Service is releasing a ne... ...Service is releasing a new stamp today that uses thermochromic ink to give us two different images on one stamp. The... ...h 29, 2006.In the first U.S. stamp application of thermochromic ink , the Total Eclipse of the Sun Forever stamps will...
https://www.neatorama.com/2017/06/20/Solar-Eclipse-on-a-Postage-Stamp/
