What was the original 'failed' adhesive that led to the invention of Post-it Notes at 3M?

One of the most ubiquitous office products began as a failed experiment! The journey from laboratory mistake to essential workplace tool demonstrates how unexpected discoveries can revolutionize our daily lives. This trivia question explores the fascinating origin story behind a product we often take for granted but that fundamentally changed how we organize information.

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An adhesive that was too weak and wouldn't stick permanently
A chemical compound that changed color when exposed to air
A transparent glue that became yellow when it dried
A formula designed for high temperatures that failed at room temperature