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The dyeing of American rivers for St. Patrick's Day is a tradition nearly as old as barfing in a crowded place. According to folks in the know, cities use dyes with a compound that turns the water green like magic. See for yourself:

Some of the best images have come from Chicago, where the normally not-as-beautiful Chicago River cuts a dramatic green path through the Windy City's heralded cityscape. Here are some of the best pictures:

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