Have you ever noticed the tiny colored square at the base of your toothpaste tube?
The square at the bottom of the tube is usually red, black, blue, green, or yellow. There was a rumour that it’s a secret code to tell consumers about the levels of toxicity in the product, which is completely false!
So what do the squares mean?
The little squares are called “eye marks” and are similar to the ones used at printers. Each box’s placement and color is detected by a machine’s light beam at the factory, and sensors tells it where to cut and fold the tube… Yay Science!