Hi Everyone!
Have you ever see patina in action?
What the heck am I talking about?
Well according to the 
The Free Dictionary.com
it’s a layer of dusting snow,
or
a layer of green coating copper or brass, 
or
a superficial impression of an uneven sidewalks that add character to the neighborhood,
or
a broad shallow dish used in Rome.
Have a great day! Hope
Definition from The Free Dictionary.com
Clip Art From Bing.com & Graphics Factory.com