What is the shelf life of cream tartar once opened?

The shelf life of cream of tartar once opened is typically around 1-3 years, depending on the storage conditions. To ensure optimal shelf life, it should be stored in a cool, dry place away from direct sunlight and moisture. Cream of tartar can be stored in its original container or an airtight container to keep it fresh and prevent any loss of flavor or quality. It's important to keep in mind that cream of tartar, like other pantry staples, may deteriorate over time, so it's a good idea to check the expiration date before using it in recipes.