Knox gelatin is a colorless and translucent hard gel like substance found in food products that is made from collagen, which is extracted from different kinds of animal by-products. It is most commonly used as a gelling agent in cosmetic manufacturing, pharmaceuticals, photography and food.
The collagen that is extracted from the bones, skin and tissues of animals such as pigs, chicken and cattle contain various amounts of proteins and peptides. When mixed with hot water and then cooled in a refrigerator, the gelatin takes a viscous form that can be eaten or even used as ballistic gel. Knox gelatin is used by swimmers to keep their hair in place because it will not dissolve in cold water.