Mono Propylene Glycol (MPG or PG) is a clear, colorless, and viscous liquid that is made up of a chemical compound called propylene oxide. This versatile chemical substance has a wide range of applications and is used extensively in the food, cosmetics, and pharmacy sectors. MPG Propylene Glycol has a good dissolving ability for food coloring and is not volatile and cheap after addition, so propylene glycol liquid is an ideal solvent for food coloring. The emulsifying and moisturizing properties of propylene glycol ingredients have been widely used in the manufacture of bread and cakes abroad.