Hello, I'm an expert in the field of food science and safety. When it comes to the shelf life of chocolate, there are several factors to consider, such as the type of chocolate, the storage conditions, and whether it's unopened or opened.

Unopened chocolate can typically last for a year or more without spoiling, provided it's stored in a cool, dry place away from direct sunlight. Once opened, chocolate should be consumed within a few weeks to a few months, depending on the type of chocolate and how it's stored. Proper storage is key; it should be kept in a sealed container to avoid exposure to moisture and odors.

Chocolate can develop a grayish-white appearance called "bloom" if it's exposed to changes in temperature or humidity. This doesn't make the chocolate unsafe to eat, but it does affect the texture and appearance. If you notice mold or a strong, off smell, these are clear signs that the chocolate has gone bad and should be discarded.

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Pure chocolate can last for two years or more without presenting any acute health risks, but it's likely to change in texture and become less appetizing after about 12 months. Given enough time, some bars could even become so dry and hard as to be inedible (or at least a danger to your teeth).read more >>