Propyl Mercaptan is a colorless liquid with a strong, unpleasant odor, often described as similar to rotten cabbage. It is a type of mercaptan, which is a class of organic compounds containing sulfur. Propyl mercaptan is primarily used as an odorant in natural gas, helping to detect leaks due to its strong smell. In addition to its use in natural gas, propyl mercaptan is also utilized in the production of various chemicals and as a flavoring agent in food. Its distinct odor makes it useful in safety applications, ensuring that gas leaks can be easily identified by smell.