Cooling beer ad

How to show that your Glacial beer brand is best served cold, in a print ad? Ad agency Ogilvy Brazil has the solution. A printed ad which helps cool your beer. Cut the ad out of the magazine, wet it under the tap, wrap it around a beer bottle and put it in the fridge. The cooling ad refrigerates your beer twice as fast. The technical trick behind it is the special salt embedded in the paper.