The sooty-looking black gunk has been here for as long as anyone can remember, creeping on the outside of homes, spreading over porch furniture, blanketing car roofs, mysterious and ever-present.
It was pollution, residents speculated, or maybe something to do with the industrial riverfront. But it turns out the most likely culprit is Kentucky’s signature product, its liquid pride: whiskey, as in bourbon whiskey, distilled and bottled across the city and nearby countryside.
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