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

The path to invention is often filled with unexpected twists! Some of the world's most successful products were discovered by accident or created for entirely different purposes than what made them famous. The Post-it Note is a perfect example of innovation emerging from what initially seemed like failure. Test your knowledge about this iconic office product that revolutionized how we organize information and communicate quick thoughts in workplaces around the world.

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An attempt to create a super-strong adhesive that accidentally produced a weak, repositionable glue
A formula for transparent tape that turned yellow and left residue when removed
A water-resistant paper project that failed but created paper with unusual adhesive properties
A color-changing ink experiment that produced sticky yellow paper as an unintended byproduct