Why cream or toothpaste tubes have a stripe at the end where is sealed?

The stripe at the end of cream or toothpaste tubes, often seen on the seal, indicates the composition of the tube material. It helps manufacturers and recyclers identify whether the tube is made of plastic, aluminum, or a combination, facilitating proper recycling processes. Additionally, the stripe can also be used for branding or aesthetic purposes, giving products a distinctive look on store shelves.