Here’s how it works:
Toothpaste tubes are printed using multiple layers of ink — typically the CMYK color model:
To prevent this, machines use the colored registration marks as alignment guides.
Sensors on the production line scan these marks to make sure:
The text is straight
The logo is centered
The colors are perfectly layered
The tube is cut and crimped in the right spot
Think of them as digital rulers — invisible to most consumers, but essential for quality control.
Why the Myth Spread
The idea that the colored squares reveal ingredient secrets gained traction in the early 2000s through chain emails and social media posts, fueled by growing concerns about:
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