Blue cheese is a type of cheese that is made with the addition of a mold culture, usually Penicillium roqueforti or Penicillium glaucum. This gives the cheese its characteristic blue-green veins and sharp, salty flavor. While blue cheese is perfectly safe to eat when it is fresh, it can go bad over time. Here are some signs that your blue cheese has gone bad:
The cheese has developed a strong ammonia smell. Ammonia is a gas that is produced by the breakdown of proteins. When blue cheese goes bad, the bacteria that cause the cheese to ripen produce more ammonia than the cheese can handle. This can give the cheese a strong, unpleasant smell.
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