The corn, oil, sugar, and salt are cooked together in a kettle. Butter salt is a substance developed in the late twentieth century for the purpose of combining the flavours found in salt and butter. It is a fine, golden powder, originally salt, enriched with butter flavouring. It is often used as a seasoning for popcorn. It is said to impart a "rich, buttery flavour.Crunch corn also called as Kettle corn was introduced to the United States in the 18th century. It was a treat sold at fairs or consumed at other festive occasions. The corn, oil, sugar, and salt are cooked together in a kettle. This produces a noticeable sweet crust on the popcorn. In the early 21st century, kettle corn made a comeback in America, especially at 19th-century living history events. It is cooked and sold at fairs and flea markets throughout the United States, especially art and craft shows. Although modern kettle corn is commonly cooked in stainless steel or copper kettles because of their lighter weight cast iron cauldron is still used to publicly cook the corn and mix the ingredients to retain the original flavour.Caramel corn is an American confection made of popcorn coated with a sugar based caramel candy shell. Typically a sugar solution is made and heated until it browns and becomes thick, producing a caramelized candy syrup. This hot candy is then mixed with popped popcorn, and allowed to cool. Sometimes a candy thermometer is used, as making caramel is time-consuming and requires skill to make well without burning the sugar. The process creates a sweet flavoured, crunchy snack food or treat. Some varieties, after coating with the candy syrup,are baked in an oven to crisp the mixture.