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Molds are surprisingly fast growing organisms. Soft cheeses like American can grow mold almost upon contact with mold spores. It is important to keep American cheese (and other soft cheeses) wrapped and sealed tightly. If you find mold on American cheese, it is not the end of the world though. Food safety sites note that cutting off the mold, one inch around and below the mold should be sufficient to remove it. Always be careful when cutting away mold to not let the knife touch it to prevent cross contamination.

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11y ago
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13y ago

Not very long. If it smells bad, It probably isn't safe to eat. Better safe then sorry.

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Q: How long can American cheese slices go unrefrigerated?
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