What was the original 'failed' characteristic of the adhesive that later became perfect for Post-it Notes?

In the world of inventions, some of the most impactful products came from unexpected discoveries or even failures. The Post-it Note is one such revolutionary product that transformed how we communicate and organize information in offices worldwide. What started as a 'failed' adhesive experiment became one of 3M's most successful products ever. This poll tests your knowledge about this iconic office supply's invention story and its journey to becoming a retail success.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

It was too strong and damaged paper when removed
It was too weak and couldn't hold any weight
It dissolved when exposed to air for more than an hour
It changed colors unpredictably when applied to different surfaces