• a fine dispersion of minute droplets of one liquid in another liquid in which it is not soluble or miscible.

Personal care products often contain distilled water and some form of oil. These two liquids cannot be mixed together to form a coherent fluid without them separating after they are blended together. Chemistry has given us products which help these two liquids join together and bond so they don’t separate after mixing. These ingredients are called emulsifiers.

There are many natural forms of organic emulsifiers, for example, mayonnaise is an emulsion of oil in water that has been stabilized with egg lecithin. In the cosmetic and personal care markets a special wax is often used, called emulsifying wax, and it is used to hold oil and water mixtures together in shampoos, conditioners, lotions and butters to ensure a smooth and consistent product.