What will happen if you open preserves and do not refrigerate?

Preserves, such as jams, jellies, and fruit butters, are typically made with high sugar content, which inhibits the growth of most bacteria. However, once opened, preserves can become contaminated with bacteria and other microorganisms from the environment, especially if they are not properly refrigerated.

Refrigeration helps to slow down the growth of bacteria and other microorganisms, thereby extending the shelf life of preserves. When preserves are left unrefrigerated, the risk of spoilage increases, and they may develop an off-flavour, texture, or appearance. In some cases, consuming spoiled preserves can lead to foodborne illness.

For safety and quality, it is generally recommended to refrigerate preserves after opening and to consume them within the manufacturer's recommended timeframe, which is typically several weeks or months. If you are unsure whether a jar of preserves has spoiled, it is always best to discard it to avoid any potential food safety risks.