Polysorbate 20 is a nonionic surfactant and emulsifier derived from sorbitol which comes from fruit and berries. Polysorbate 20 is a water soluable yellowish liquid used as a dispersing agent (which means it mixes oil and water together). It is a fragrance stabalizer, adds moisture and has a soothing effect on the skin. Typical ratio is 1 part Polysorbate 20 to 1 part fragrance or essential oil. For room and body sprays, use at a ratio of 2 parts polysorbate 20 to 1 part fragrance or essential oil, add a little distilled water to the polysorbate 20/fragrance oil and shake well before adding the balance of water, and then stir well. .