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

In the world of everyday inventions, some of the most impactful products came from unexpected moments of innovation. Post-it Notes revolutionized how we organize information and have become ubiquitous in offices worldwide. But do you know the fascinating story behind this famous product's creation? Test your knowledge about one of 3M's most successful accidental inventions!

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An attempt to create a super-strong adhesive that accidentally produced a weak, repositionable one instead
A failed attempt to develop heat-resistant bookmarks that wouldn't damage book pages
A paper recycling experiment that unexpectedly created paper with adhesive properties
A color-changing paper project that produced yellow sheets with sticky edges as an unintended side effect