Thier is a wide claim that squares on the tubes have different colors that indicate medical, organic, or chemical existence. However, This is Completely untrue. The squares called “eye marks”, are marks used in the packaging process and do not indicate the chemical content of the tubes.
Actually, any tube has a rectangular or a line mark to help in the packaging process . These marks are known in the packaging industry as “eye marks” and they do not indicate the chemical content of the tubes they are displayed on, regardless of what color they are.
So, If you really want to know what are the content in a certain tube, you will find them listed right there on the side of the tube in some detail. Thus, Do not base your search on the colored squares on any makeup or toothpaste tube.