Palm Beach Post (blog) |
Breaking: New solar eclipse stamp does something no other stamp can
Palm Beach Post (blog) The Total Solar Eclipse Forever stamp is the first from the post office to use thermochromic ink, which is sensitive to heat. When the new stamp it is touched, the stamp's image changes from a blacked out sun with a silvery corona to a bright picture … USPS solar eclipse stamps use body heat to reveal the moon Stamps change with heat to create total eclipse of the mail New stamp celebrates upcoming solar eclipse with heat-reactive transformation |
More: continued here
