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

The journey from invention to market success often involves unexpected turns and brilliant pivots. In the world of product design, some of the most common items we use today emerged from failed experiments or accidental discoveries. This poll tests your knowledge about the fascinating origin story of 3M's Post-it Notes, one of the most iconic office supplies that revolutionized how we organize information and communicate in workplaces worldwide.

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A super-strong adhesive that wouldn't come unstuck
A weak adhesive that was criticized for not sticking well enough
A yellow dye originally intended for highlighting text in documents
A heat-activated glue that could be reused multiple times