Chemically, the qualities that make a spice a spice are its rare essential oils and oleoresins, highly volatile compounds that impart to the spices their flavor, aroma, and preservative properties,  -   Jack Turner     Quotes
Chemically, the qualities that make a spice a spice are its rare essential oils and oleoresins, highly volatile compounds that impart to the spices their flavor, aroma, and preservative properties, Jack Turner