Storage
Sour cream is not fully fermented, and as such must be stored under refrigeration. As with other dairy products, it is usually sold with an expiration date stamped on the container, though whether this is a "sell by" a "best by" or a "use by" date varies with local regulation. Food authorities, such as the USDA, advise that sour cream with visible mold should be discarded, as it may be contaminated below the surface and could contain dangerous mycotoxins and aflatoxin.
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