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jan 22, 2017 - US Postal Service issued stamp printed with thermochromic ink

Description:

which responds to changes in temperature as one touches it. The image is a solar eclipse that becomes the moon. It reverts to the original image as it cools.

Added to timeline:

printing

ByMartin
16 Oct 2017
0
0
1227

Date:

jan 22, 2017
Now
~ 9 years and 5 months ago

Images:

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