Remember “scratch and sniff,” the bygone technology behind fragrant children’s stickers and magazine inserts?

It has lingered in the nation’s memory for a half-century. Like an insistent odor, some might say. Now, the United States Postal Service is granting it an essential American honor: a Forever stamp.

Next month, the agency will introduce a set of seasonally themed odoriferous scratch-and-sniff stamps, its first ever.

The 10 stamps will feature watercolor illustrations of popsicles meant to evoke “a sense of summer nostalgia,” the artist who drew them, Magrikie Berg, said.