The Economic Times

White crystals suddenly appearing on aged cheddar can look like mold, but they may simply be harmless calcium lactate crystals formed naturally as the cheese ages

For cheese aficionados, the appearance of white crystals on aged cheddar can spark concerns about spoilage or mold. However, these calcium lactate crystals are a natural part of the aging process, especially in drier varieties like sharp cheddar. Studies have shown that they are commonly found in aged cheeses, and they can be easily identified by their hard, gritty texture, distinguishing them from unwanted mold.