Hoax: Meaning of Squares on Tubes

A graphic circulated online attempts to explain the colors of squares that appear on tubes of various products. It is claimed that different colored squares on tube packaging indicates the chemical content of the product. Today we'll take a look at this claim.

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It’s not true.

The squares on tubes are called “eye marks.” Let’s first take a closer look at the claim.

Did you know squares on tubes mean something?
Green: All natural
Red: Some natural, but most chemicals
Black: Only chemicals are used.

This is completely false.

Another variation claims:
Black/Blue line: 100% chemical
Red Line: 50% chemical, 50% natural
Green Line: 100% natural

Eye Marks

In reality, squares found printed on tubes are merely marks used in the printing process. They are referred to as “eye marks” and read by a sensor in the manufacturing process in order to detect and align squeeze tubes.

Typically, the color of the square is also a color of something else being printed on that side of the tube. Tubes of Crest toothpaste, for example, often have blue writing and matching blue eye marks on the back of the product.

Chemical vs Natural

The simplistic – and completely incorrect – explanation in the hoax graphic does not explain the difference between “chemical” versus “natural.” The world around us is full of chemicals which occur naturally. Or, to quote the definition of “chemical” on about.com: Everything is chemical.

Bottom Line

Squares printed on tubes have absolutely nothing to do with the chemical makeup of the product inside. It is merely a mark used by sensors in the manufacturing process. The color of the eyemark is typically chosen from the available colors used in the artwork on the tube.

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  • Timothy Campbell

    OMG! I’m made of chemicals!!!

  • Biswanath Palai

    what about ramdev baba’s patanjali Saundarya face wash??? Is it chemical or natural…?

    • waffles

      It depends on what your definition of “natural” and “chemical” are. It appears that the ingredients are: Citrus reticulate, Azadirachta Indica, Ocimum sanctum, Aloe vera, Gel base, Glycerin, Vitamin E, Diazolidinyl Urea and IPBC, color and perfume.

    • Ashvin Patel

      Its pure natural, and nothing mean by the color mark on the crimp.
      Its hoax only.
      Plz check with internet.

  • Nick Oba

    Thanks for the debunk!

  • Kai Ling Chang

    Thankyou for your information

  • Jill Maurice

    If they mean nothing why are they different colors?

    • waffles

      They simply use an ink color being used on the packaging.

    • adrian

      colors are depends on the product packaging color so that the photo sensor sensetivity will know when to stop and run

  • Ain

    Thanks for setting this straight. It’s quite annoying to see people spreading hoaxes like this. Anyways, may I suggest you create links to share your entries in multiple apps / social media like Facebook (where most hoaxes are spread nowadays), stumbleupon or pinterest? It would be most helpful.

  • David

    So why would they then waste ink to mark the tube? That makes no sense waffles.

    • waffles

      It’s used for the printing process. This is a common procedure. In most cases, these “eye marks” are printed in an area that is trimmed off later. In the case of tubes, due to the shape of the product, they don’t necessarily have an area that will be trimmed later.

  • DanPL

    If these colors are just printing codes, why only four colors? (primary colors)?

    • waffles

      It can be any color. They typically use a color of ink being printed elsewhere on the tube.

      • Eric

        Usually those colors are the dominant or “corporate” colors , Like on Crest you will find the color of the square to be Red , because the crest logo is Red like that middle tube on the picture above, also on that picture you will see that the 2 tubes on the right are bearing green color square , well because the color used in the printing, well , is green.. :)

    • sara

      Green and black are not Primaries colors. :)

  • DanPL

    Thanks Waffles. But why only four colors are used in the whole toothpaste industry? Coincidence or a secret? Any scientific proof from the “chemical content” camp, or disproof from the tube-end eye-mark camp?

    • Charlie

      Hi DanPl… I just want to set the record here. I work as a graphic designer in the printing industry and I can verify this fact that the code is the ink being used. Generally there are different processes of print be it one color or 4 color. 4 color uses the CMYK spectrum which is cyan magenta yellow and black, 1 or 2 color printing just uses pantone ink which is used from a color swatch. If you notice on the box of cereal you have you might see these four colors somewhere on the inside flap. In many processes the use of a specific pantone color is more expensive to print then say a generic blue from the printing press. Pantone colors need to be mixed which make them more expensive. If you notice the color of the text is always the same as the color bar. So please don’t believe everything you read.

      • waffles

        Good explanation Charlie.

  • DanPL

    I mean does anyone do chemical content analyses to correlate the color squares or to tell us that the green square has more hard “chemical” that the black-squared tube as the myth says otherwise?

    • waffles

      The printing process is unrelated to the production of the contents of the tubes. Printers use eye marks for alignment in color printing. You may sometimes see eye marks on newspapers or in magazines, and these also have nothing to do with what is written on the page.

  • hitesh patel

    what does the black mark indicates on any toothpack does it seems to be chemically manufactured…?

    • waffles

      The color of ink used on packaging doesn’t indicate anything about the contents.

  • gopa

    you seem to be saying the same reason in all your replies Mr waffle? what is the reason for your strong conviction on this fact? do u work in the toothpaste regulatory board? or are you surviving on some piece you read off. a bok shelf?

    • waffles

      Actually my parents owned a large print shop, for which I worked in their pre-press department as a teenager. We used eye marks on all of our color print jobs. It’s a standard procedure in the printing industry.

  • debra korb

    Mr. Waffles is correct. In printing all colors are made from 4 colors and yes you need an eye Mark to male sure everything lines up. Most think this is an industry without skill when in reality it is a skilled job! The Mark is for the printing process and not for anything else! Glad to see that Mr. Waffles took the time and made the effort to debunk this silly rumor! I would be more concerned about the country the tooth paste is actually made in and make a purchase decision based on that rather than a color coding rumor!

  • Jerry Lonsdale

    the indicator marks are also found on many different products, even newspapers use a block of them, its simple identifying marks, Toothpaste Tubes would be produced by one manufacturer but the toothpaste owners may get their tubes filled in the same filling factory as other brands, photo sensors on the machines in the filling plants would need to know that whats on the tube goes in the tube hence the need for indicators.

    The indicators also show the machine that the tube is the right way up when being filled its too costly not to have indicators, many folks would do well to read up on manufacturing process’s and watch the odd “How its Made” on Discovery, you will be surprised how most of our daily products and items are made, I do know there are scrupulous manufacturers out there who make dodgy products, those products end up in the 99p and 99c stores, discounted food stores selling food items with reputable companies names on the boxes are ones to avoid, the reputable companies sell off the products that do not meet their quality control thats what you should be weary of, boy what a rant, sorry

  • Ravi

    Especially in India this rumor is very strong & the people encash on the rumor. Mr.Waffles clarifications is correct but is there any one from the Manufacturing industry post a second opinion. This would be helpful to a great extent to educate the people from the rumor.

  • Behnam

    Is there anybody to give us a refrence link??!! a formal refrence link, not a personal website?

    • zitfrit

      did you need a formal reference to believe that mith in first place? or just a facebook post?

  • Narsingh

    It’s true that there is no business about colour strip on toothpaste. Some people just read the only few lines of the article and pasted on social media. So we’ld be careful in future or refrain from this posts.

  • ruch

    I do get what you are saying completely. Just so that I could explain it to someone who’s convinced by the haux why does the same company use diff color ink on two of their products? eg. two diff colgate products have two diff colors

    • waffles

      The colors of the packaging is simply a matter of design. Obviously they want various products to have their own look and identity.


    How can we be sure your info is not a hoax too?! Where is your source of info?

    • waffles

      First-hand experience with a family-owned print business.

  • Kenny Kenny

    Mr. Waffles, First-hand experience….so you can only speak to the printing process and not to the actual make up of the content in these tubes, as you have not tested any of the various product to determine their chemical or natural contents?

    • waffles

      The color of the ink is chosen based on existing inks being used on the packaging. So, for example, if a tube has blue, green, and brown inks, then one of those would be chosen for the eye marks. This color is completely unrelated to the contents and is determined on the print end of the process.

  • Nayan Patel

    Agreed with you waffles..I was curious to know the reality of this color mark which you cleared nicely. Thanks

  • ana

    it must be related because I use crest 3D which I am assuming contains lots of chemicals to assist with the whitening of teeth and guess what color the tube has…right BLACK…theres got to be some truth to the claim

    • waffles

      Or black could be one of the inks used in the design of the tube, thus more convenient as eye marks..

    • Brian

      LOL– I use crest 3D also and the mark is blue. The color of the square is not related to the product in the tube.

  • luis

    Oral-B toothpaste color packaging is blue and the square is red. Any thoughts?

    • waffles

      It only takes a small amount of red in the design to make it available for eye marks.

  • Carlosvaz

    Imagine the disastrous results of all those chemicals and aromatics degluted daily by toothpaste users.

  • navdeep gupta

    i want to know that patanjali’s toothpaste of ramdev baba, herbodent tooth paste of dr jaikaran from jaikaran herbals and vicco tooth paste from vicco’s laboratories are showing black colour on there crimp are natural or totally chemical based.pls reply me soon.

  • abdul basith m

    hi, what about white line ? i see white line in few face wash ?

  • connnnnnnie

    Ive been raised in printing press environments too & its easier & cheaper to use black ink for markers no matter what color the packaging…bread twisties come in diff colors has meaning, the olympic rings’ colors all have meaning, every flag ever made holds meaning in their colors….whether or not its a hoax or valid, we should ALL KEEP PERSISTENTLY questioning those who claim they possess authority & who mass produce items we blindly consume as well as those who attempt to dissuade our skepticism….also the fact that fb “suggested” link to this forum directly behind a person’s post making the content code claim makes me think you’re in some way promoted to repeat the same random printing facts n u prolly werk for monsanto

  • rhythm

    i have an old tube of so called “natural toothpaste” named “claybright natural toothpaste” that is green blue and red in color packaging with a black stripe on the back. there is no black on the packaging and the ingredients are: Sorbitol, Glycerin, Sodium Bicarbonate, Calcium Montmorillanite Clay, Hydrated Sillica, Kaolin, Carboxymethyl Cellulose, Sodium Cocoly Glutamate, Sodium Lauryl Sarcosinate, Stevia Extract, Purified Water, Grapefruit seed extract, Aloe Barbadensis Leaf Juice, Methenol, Spearmint oil, Sodium Ascorbate, Boron Citrate, and Zinc Citrate. Unfortunately I did not read the ingredients until I got home & this article seem to be very fake to me. wtf is all this sh-t???? I cant pronounce most of it and Im supposed to believe that the black stripe only relates to the color packaging? NOT!!!! there is nothing else black on the tube but the stripe. This so called natural toothpaste is really all chemical based. you have not debunked anything!!! those stripes on the back mean montsanto is involved and you are trying to lie to the public!!!

    • waffles

      By all means don’t take our word for it. Ask anyone who has ever worked in a print shop about “eye marks” and you’ll get the same answer.

      And everything on the planet can be called “chemical.”

      • John Baker

        It’s true that the “eye marks” are markers used in the manufacturing process, but not for printing. Toothpaste tubes come off the press connected. The eye marks are alignment marks for the automated machines that cut the tubes apart.

  • rhythm

    i agree with u 100%

  • Milan

    If so why don’t we find this “eye mark” in all kind of tubes ?????????? why only in toothpaste ??????????? !!!!!!!!!!!!!!!

    • waffles

      You do find it on all kinds of tubes – anything manufactured using the same process as toothpaste tubes. Google “printing eye marks” – it’s a very common technique.

  • drab

    Mr. Waffles, you are a very patient individual.

    • waffles

      Thank you! It is said to be a virtue, and sometimes these comments prove why this is so.

  • http://wafflesatnoon.com Waffles At Noon

    Thanks for the comment. Let us know what happens after you contact them. And if they are still in denial, have them ask a print shop!

  • Tammy

    Here is one easy way to find out. Google eye mark and there are videos showing you how they use the eye marks in the packaging plants to measure the length of the tube or package.