Cloves are the immature unopened flower buds of a tropical tree. When fresh, they are pink, when dried they turn to a rust-brown color which is a sign of essential oil in it. They resemble small nails, with a tapered stem (Clove translates to nail in Spanish). The large end of the clove is the four-pointed flower bud. Clove essential oil has received considerable interest due to its wide application in the perfume, cosmetic, health, medical, flavoring, and food industries.