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Penicillium roqueforti is a species of mold that is crucial for the production of blue cheeses, most notably Roquefort. This fungus is mixed with either the milk or the curd during the cheesemaking process.1

During the ripening period, which typically lasts three to six months, the mold grows within the cheese, creating the characteristic blue or greenish veins. This growth occurs naturally in small openings or through machine-made perforations. For authentic Roquefort cheese, which is made from ewe's milk, the aging process takes place in the cool, humid limestone caves of Roquefort, France. This specific environment promotes the development of Penicillium roqueforti, giving the cheese its distinctive sharp, tangy, and salty flavor.12

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2 Britannica Sources
  1. Roquefort
  2. blue cheese

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