Maize starch, also called cornstarch, is a product obtained from the wet milling process of maize. Maize caryoxides (grains) are placed in a solution of sulphur dioxide. Once softened, the grains are subjected to a cycle of milling and centrifugation in which the starch and gluten separate. This is why maize starch is well tolerated by people with celiac disease. However, it is important that the product is labelled as suitable for celiacs because maize starch may come into contact with wheat flour or other products containing gluten in many establishments. It is presented as a very fine white flour which in contact with the boiling water, forms a paste that, cooling, gels.