Colour Bar at the Bottom of the Toothpaste Tube

Recently have read a "useful tip" from social media stated the original meaning of the colour bar at the bottom of the toothpaste tube.


Green: natural
Blue : Natural + Medicine;
Red : Natural + Chemical composition;
Black : pure chemical.

However the above information is not truth. The rectangular marks or lines on tubes referred to in the message, are using in the packaging process. The marks are known in the packaging industry as "eye marks" (or sometimes "eye spots"). Details can be found in http://www.hoax-slayer.com/squares-on-tube-hoax.shtml