The colored square found at the sealed end of toothpaste tubes has been the subject of various interpretations. Popular online myths suggest these squares indicate the composition of the toothpaste, with different colors supposedly representing varying levels of chemical versus natural ingredients. This assertion, however, lacks validation from credible sources and is largely considered to be misinformation.
The color marking serves a functional purpose within the manufacturing process. It acts as an eye mark, allowing optical sensors to identify the end of the tube during filling and sealing. This ensures that the tube is properly cut and sealed at the correct location, maintaining efficiency on the production line. The specific color used is often determined by factors such as contrast with the tube’s packaging design.