The internet is full of valuable information which you find useful in daily basis. However, it is also home for many websites and social platforms which spread false information just to get attention. Sometime these false informations are so intriguing that people start to believe those without giving it a second thought.
One such hoax is related to the small colourful rectangular markings you see on the bottoms of every toothpaste tubes. This is largely believed to be the toothpaste color code. There are hundreds of articles about the meaning of these colours. The authors of those articles claimed that the colour directly relate to the ingredients of the toothpaste.
According to the posts, ■ green marks mean the toothpaste is made from only natural ingredients, ■ blue marks mean it contains a mix of natural ingredients and medication, ■ red marks mean it contains both natural ingredients and chemical ingredients, and ■ black marks mean it contains only chemical ingredients. The posts warn people against toothpastes with red or black marks and encourage people to choose toothpastes with green or blue marks instead.
The first thing is that there is no 'secret' meaning of these colours. Even manufacturers print name of the ingredients on the product. You must be wondering, so why are there colour blocks on toothpaste tubes then? But did you notice that almost all of the packaged products have that kind of marking.
This colour is meaningless to us humans. The coloured patches are used as guides by the electronic sensors installed on the FFS (Form, Fill, Seal) machines to ensure that the heat sealer-cum-cutter does it's job correctly by not sealing the packaging randomly. Without this markings these automated packaging machines can not do their work properly.