Corn wet-milling is a process where components of corn kernels are extracted to produce a highly purified product. Most of the products from this process are valuable and mainly required by the food industry. Through this process, every part of the corn is useful to produce the quality ingredients. The characteristics of this process are based on physical separation of components, mostly by weight and size. Water is needed as it is a wet process and it works as separation / carrier agents in washing steps. There is also a pre-soaking process called steeping. The corn is soaked in a sulphur dioxide solution, this aids with this separation process.