Why toothpaste tubes have coloured square markings

You might have heard in the past that the coloured markings – usually squares or rectangles – on toothpaste tubes denote what's inside.

The internet is awash with falsehoods. One of them is that the 'signs' provide consumers with information by way of blue or red signs that signify the composition of the product.

The biggest lie,  is whether the toothpaste has 'natural' or 'chemical' ingredients, and whether it contains 'medicine'.

Why do toothpaste tubes have coloured markings?
The coloured markings, however, mean something totally different. They're part of the manufacturing process and are known "eye marks" or "colour marks".

The printed symbols can be read by light beam sensors and identify where packaging should be cut or folded during the manufacturing process. They material is part of connected units that stream through machinery at high speed.

The coloured markings allow the machines to see, quickly, where to cut, fold, and so on.
The markings can be read by light beam sensors and typically identify where product packaging is to be cut or folded as connected units stream through machinery at high speed.

According to Snopes  "The colours of eye mark registers are not limited to the ones mentioned above (and may not necessarily be visible on the finished product), and the different colors simply signify different types of packaging or different types of sensors."

Source: mirror.co.uk