What was the original adhesive used in Post-it Notes initially considered by 3M scientists?

When we think of revolutionary inventions, we often picture complex machinery or digital technology. However, sometimes the simplest products make the biggest impact. The humble Post-it Note revolutionized office communication and organization worldwide, but its creation story involves a fascinating intersection of accidental discovery, persistence, and innovative marketing. Test your knowledge about this iconic sticky note's journey from failed experiment to essential office supply.

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A successful super-strong adhesive that was repurposed to be weaker
A failed experimental adhesive that was too weak for its intended purpose
A deliberately engineered temporary adhesive created specifically for removable notes
A natural plant-based substance discovered in a tropical rainforest expedition