Halle's salt, also known as potassium sodium tartrate, is a chemical compound that appears as a white crystalline substance. It is commonly used in various applications, including food processing and as a buffering agent in laboratories. This salt is derived from tartaric acid, which is naturally found in grapes. In addition to its culinary uses, Halle's salt plays a role in the production of certain pharmaceuticals and is utilized in the preparation of some types of glass. Its unique properties make it valuable in both industrial and scientific settings, contributing to its versatility.