Ethoxyquin 

Ethoxyquin is a quinoline based food preservative which is commonly used to prevent the rancidification of fats, or has also been used in spices to prevent color loss due to oxidation of the natural carotenoid pigments. This antioxidant is widely used throughout the food and beverage industry being added to chili powder, ground chili, and paprika to retain color. Ethoxyquin is a yellow liquid that is insoluble in water.