Flour in 1878 at the Washburn "A" Mill in Minneapolis which killed 22 people. Bread, pasta, crackers, many cakes, and many other foods are made using flour. Wheat flour is also used to make a roux as a base for thickening gravy and sauces. It can also be used as an ingredient in papier-mâché glue. Cornstarch is a principal ingredient used to thicken many puddings or desserts, and is the main ingredient in packaged custard. Flour Flour is a powder made by grinding raw grains or roots and used to make many different foods. Cereal flour is the main ingredient of
Wheat flour (usually a pin mill). These finer bran and germ fractions are then reintroduced to the endosperm ("white flour") to produce whole wheat flour made of 100% of the kernel of wheat. Wheat flour is available in many varieties; the categorization is regional, and the same name may have several different regional meanings. Indian flours are generally categorized by how much of the grain is stripped away. American flours are categorized by gluten/protein content, processing, and use. A device called Alveograph Chopin invented in 1921 by Marcel Chopin, provides an index called W that is now commonly used by professional bakers.