Store-bought, tomato-based sauces are often processed thoroughly to prolong their shelf life, and contain plenty of acid from the tomatoes. These factors make them more resistant to bacterial growth, which is why unopened jars can often be stored in the pantry. Canned tomato sauce should definitely be kept out of the refrigerator before opening, as the metal cans tend to react with the humidity of the fridge, resulting in rust or corrosion.

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