Patina

noun

DEFINITION-“A green or brown film on the surface of bronze or similar metals, produced by oxidation over a long period.”

ORIGIN– “mid 18th century: from latin, from latin patina ‘Shallow Dish”

EXAMPLE– My dads old car is starting to build some “patina” on the hood and the the trunk of the car

IMAGE–     https://goo.gl/images/gdsH8h