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May 19, 2012 02:14 am PDT
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/KNqZEajhnKI/hidden-pint-glass-qr-code-is-o.html
Hidden pint-glass QR code is only visible when filled with Guinness
A clever bit of advertising gimmickry from Guinness: these pint glasses bear QR codes than can't be read when the glass is empty, nor when it is filled with amber-colored beers. But when filled with black, murky Guinness, the revealed QR code can finally be scanned: "it tweets about your pint, updates your facebook status, [...]Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/KNqZEajhnKI/hidden-pint-glass-qr-code-is-o.html
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