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

In the world of product development, some of the most successful innovations emerge from unexpected origins or even mistakes. The journey from laboratory accident to market dominance can reveal fascinating stories about perseverance, vision, and creative problem-solving. This poll tests your knowledge about one of the most ubiquitous office products that transformed how we organize information and communicate ideas.

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A super-strong adhesive that accidentally turned out to be remarkably weak but removable
A waterproof paper that couldn't repel water but had excellent absorption properties
A heat-resistant coating that failed temperature tests but showed excellent color retention
A permanent ink formula that unexpectedly faded quickly but left no residue