NATIONWIDE -- The United States Postal Service released a unique solar eclipse stamp on Tuesday.
The stamp is a photo of the total solar eclipse captured in Libya more than a decade ago.
What makes the stamp unique: It's the first stamp to use what's called thermo-chromic ink. When your finger touches the stamp when it's black, the image changes to the moon one on the right. Once the stamp cools, the black eclipse returns.
The next real total solar eclipse is expected to happen Aug. 21.