The USPS says this is its first time using thermochromic ink and that the set will be part of its Forever Stamp collection. So, three years from now, if you really need a stamp and postage price has increased, you won't have to double up with additional stamps when sending that handwritten letter to grandma.

Want to celebrate the stamp? Maybe plan a summer road trip to the University of Wyoming's art museum for the postage's First-Day-of-Issue ceremony on June 20th.