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I have some American Cheese with fine white crystals on the outside of each slice. They have a gritty texture. Is this a sign that the cheese is spoiled, or just lactic acid salts like aged cheese gets?

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You can grow crystal on cheese? Can you post a picture? – KMC Jan 13 '12 at 2:34

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It is calcium lactate crystals. It is safe to eat. On regular cheeses it is a sign that it is aged well. For packaged, sliced american cheese I am not sure I would care for it. But it is a matter of personal preference.

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We made grilled cheese sandwiches with it. They tasted fine. – Frank Szczerba Jan 13 '12 at 18:16

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