Perhaps some of you have already heard this, or maybe not, but there is such a version of the origin of colored "squares" or marks on tubes with toothpaste, cream, etc.: trade mark, but by its natural purity!
Note that each toothpaste tube has a square or rectangular symbol at the bottom. It comes in a variety of colors.
If the square green, which means that your pasta consists entirely of natural substances.
If he blue, which means that there are both natural remedies and medicinal substances.
If he red, which means that in addition to natural ingredients, some hazardous chemicals are included in the toothpaste.
But if the color the black, which means that the paste is COMPLETELY composed of chemicals, and there is nothing natural in it at all!
Manufacturers have been using such markings for a very, very long time, but most consumers, of course, are not aware of what this all means. Only a few people are "aware" of this information."
Most likely, this version arose after the TV story:
In fact, the statements above are just a myth. Although you must admit that it would be convenient to make such markings on products:), even though the terms natural, medicinal, chemical are too vague to be useful.
It's all about the printing production of the tubes themselves. In tube manufacturing, light sensors on equipment need tags to read them. So that the machine can correctly determine where to cut or seal the tube. Different colors only indicate different types of sensors or different types of packaging.
The best way to find out the composition of a toothpaste is to look at the ingredient information printed on the tube itself or on the packaging box.