Who Invented the Post-It Note? the Complete Story of Spencer Silver, Art Fry, and 3M
The iconic shade of the original 3-inch-by-3-inch square Post-it Note was neither an ergonomic design calculation nor the product of consumer focus groups. It was another consequence of sheer convenience.
When Art Fry and the engineering team assembled the preliminary pilot runs at 3M's processing facility, they needed scrap paper to feed into the newly modified coating machines. The lab adjacent to Fry’s development space held an abundant surplus of discarded yellow scrap paper used for internal office communication and technical printouts.
The team loaded the leftover yellow paper stock onto the prototype rollers. When the product passed into testing, users responded enthusiastically to the contrast between black ink and the soft pastel canary background. By the time commercial rollouts occurred, 3M decided against changing the color. That random paper scrap established a visual identity so recognizable that 3M continues to defend canary yellow as a registered trademark worldwide.
