The small, coloured rectangles discovered on the crimped finish of toothpaste tubes have been the topic of persistent on-line rumors. These rumors typically recommend the colour signifies the chemical composition of the paste, with completely different colours supposedly representing various ranges of pure or chemical elements. Nevertheless, this interpretation is just not supported by scientific proof or manufacturing practices throughout the business.
Truly, these marks serve a sensible objective throughout the manufacturing and packaging course of. They’re registration or eye marks utilized by optical scanners on high-speed packaging equipment. These sensors detect the marks, signaling to the machine the place to chop, fold, and seal the tube exactly. The colour is chosen primarily based on distinction with the background of the tube to make sure dependable detection by the sensors, optimizing the effectivity of the manufacturing line.
