propionic acid is formed at the same time as the eyes, and they are said to be the result of a propionic ferment of lactic acid.
propionic acid pro·pi·on·ic acid (prō'pē-ŏn'ĭk)
A fatty acid found naturally in sweat and as a product of bacterial fermentation, used as a mold inhibitor in bread. Also called propanoic acid.
A liquid fatty acid found naturally in sweat and milk products and as a product of bacterial fermentation. It is also prepared synthetically from ethanol and carbon monoxide, and is used chiefly in the form of its propionates as a mold inhibitor in bread and as an ingredient in perfume. Chemical formula: C3H6O2.