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Claim: The lines on red Solo cups are markings to designate serving sizes of various kinds of alcohol.
Example:[Collected via e-mail, June 2012]
I have seen multiple postings via web and pinterest that the
lines on the old red solo cups are actually measuring lines for amounts of
alcohol. Can you clear this up, please?
Origins: According to common bit of lore, the seemingly random lines found on the ubiquitous Solo brand cups used at parties everywhere actually delineate the proper filling level for various kinds of alcohol: the bottom line is for a shot of liquor (1 ounce), the middle line is a serving of wine (5 ounces), and the top line is the right amount of beer (12 ounces):
Those measurements do generally correspond to some standard alcohol serving sizes, but the placement of the lines isn't intended as any kind of serving guide: a shot of liquor is generally 1.5 ounces rather than 1 ounce, not many people drink wine out of Solo cups, and beer is usually poured into a Solo cup until the cup is full rather than being carefully measured out at 12 ounces.
According to Dart Container Corporation, the parent company of the Solo brand of iconic red Party Cups:
The lines on our Party Cups are designed for functional performance and are not measurement lines. If the lines do coincide with certain measurements, it is purely coincidental.
In response to this rumor, Dart produced a tongue-in-cheek chart showing just what those lines indicate: