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snopes
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Comment: On the bottom of every Coke can, Sprite can, Dr. Pepper can, etc. there is
always a colored dot. It can be blue, green, purple, as well as a variety
of other colors. I've been told this dot means that the can has been
"checked" or whatever to make sure it's not "poisonous." However, today we
found a Dr. Pepper can that had no dot- Do you know anything about these
random dots and what they mean?

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damsa
The Red and the Green Stamps


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My guess is the day of the week/month/year or location where the Coke was filled. Or during the can making process, the can maker marks the bottom to determine which plant or machine made the can.

I am more leaning toward the can maker making the mark.

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Rehcsif
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As a chronic pop drinker, I have several empties on my desk right here:

The following have no dots, but do have some sort of date code: Diet Mtn Dew, Pepsi one, Diet A&W.

I also have a diet coke can that has a greenish dot on it. It doesn't look so much like a deliberate dot as that something spilled on it...

-Tim

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The Ota Faction
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Mwa ha ha ha! Teh Gay Agenda(TM) strikes again! By placing dots of rainbow colors on cans of soda that grade school children drink, teh Gay Agenda(TM) has taken another step towards a 100% gay America!

[fish] I'm in a silly mood today.

Or perhaps its how the can manufacturers differentiate which shipment of cans is going to which bottling plant?

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Atlanta Jake
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Are we talking about the register marks that the printers use? They use them to line up the work when printing several colors, so that the images line up.

From this site:
quote:
Register Marks - symbols used in colour printing to position the paper correctly - usually crosses and circles.


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The Amazing Rando
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I don't think that's it. These are usually green splotches that look sort of like they accidentally dripped on. I don't see them on most cans, but almost always on Orange Slice.
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BeachLife
The Bills of St. Mary's


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I just happen to have a few grocery sacks full of cans near by. A lot of the cans have a splotch of some random color on the bottom. No set pattern or position though. And a lot of cans have no splotches. They do all have lot codes on them which is how the manufacturer can trace each can back to when/where it was bottled.

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FullMetal
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same, I just noticed those quick sampling of the coke cans on my desk, there are light blue, purple, and yellow, one can had none. i drank it and it was fine... [Razz] one had it on the lip of the bottom of the can, so i'm inclined to believe it's added after the can has been made,

possibly an inspection mark?

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Minarvia
The Red and the Green Stamps


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Well, I have a can of coke right now at my computer and I look under the can. I found out that there is no dot on the bottom of my can. [Roll Eyes]
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Die Capacitrix
We Three Blings


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It's quality control. From here:
quote:
The Nordson Ink-Dot I.D. system identifies which spray machine coats each can on the line. The system applies a small dot of ink on the bottom of each can as it enters the spray machine. A different ink color is used for each machine on the coating line, so the source of unacceptable coatings can be immediately identified. There is no need to shut down all machines on the line to determine which machine is producing the defect.
And the picture on the site even shows a Coca-Cola can.

ETA: Perhaps the cans without dots are processed where there is only one machine, so it's not necessary to determine which machine failed.

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Rehcsif
We Three Blings


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quote:
Originally posted by Die Capacitrix:

ETA: Perhaps the cans without dots are processed where there is only one machine, so it's not necessary to determine which machine failed.

Or if only one machine at a plant is without the ink capability, that identifies that machine as well...

-Tim

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