According to USPS if you touch stamp it will turn dark.
The United Post Office will issue a stamp on June 20th, that celebrates the summer solstice in August. I'll post a picture in answers. Will you buy one just to see what it does?
That's pretty cool. I just might have to buy one.
Wow!!!! That's neat! I do want one!!
Neat. I want one.
I'm buying.