What began as a normal snack moment quickly turned confusing when a child opened a bag of sour cream chips and found “a small blue disk inside.” Unsure what it was, the parent stopped the snacking and turned to the internet for answers.

After sharing a photo and reading responses, the explanation became clear. The object was not dangerous, but part of an important safety process many consumers never see.

The disk is “a test device used in food production,” designed to go through metal detectors during manufacturing. Its purpose is to confirm that machines can detect metal contamination before products leave the factory.

These items are “a routine part of quality control,” commonly used in chips, cookies, and other packaged snacks. While rare, they can accidentally remain in a bag, but they are “completely harmless.”

Though finding a foreign object can be alarming, the discovery actually highlights how carefully food is monitored. The disk “help[s] guarantee that the snacks we enjoy meet the highest quality and safety standards,” offering a rare look behind the scenes of food safety.