Non-chill filtered
Bird Creek is deliberately not chill filtered. Chill filtration removes long-chain fatty acid ethyl esters — primarily ethyl laurate, myristate and palmitate, which come from the grain and from barrel wood extractives — by chilling the spirit below freezing and filtering. Those compounds carry a significant portion of a whiskey's aroma, body and mouthfeel, which is why we and many respected distilleries choose not to remove them.
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The tradeoff is that those esters have limited solubility at 46% ABV and can come out of solution when the product is exposed to cold — in transit, in an unheated storeroom, or under refrigeration. They form a light, cloudy aggregate that disperses back into the spirit when the bottle is shaken and redissolves entirely when the whiskey returns to room temperature. This is a reversible physical process, not a defect and not a change in the product.