Blue cheese is made from mold. So how do you know when it goes bad?

Each cheese is cultured from a particular species of mold. But at any point in the life of a cheese, unwelcome species of mold can join the party. And once a bad mold joins the party, it’s over, says ExercisetoEat.

There are a few signs of cheese destruction to look for. First, the cheese may change color. If the white part of the cheese was originally ivory and turns straw-colored, that’s a sign something is horribly wrong, says rockycat. That also applies if the veins of the cheese were originally blue and now they’re green. Second, a noticeable ammonia smell may appear in a cheese gone bad, says monavano. Finally, toss out cheese that’s covered in fuzz. “I found blue fur/fuzz on some crumbled Danish blue cheese once. I love the strong flavor of Danish blue … but not with fur on it,” says TarheelYankee.

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