Patina refers to a type of finish on metal that is created when the bare metal is exposed to the elements and a special chemical process that rusts the metal. This gives the metal an old worn and weathered look which is very popular for creating a rustic look to your home decor.
However, the patina finish is not to be confused with a solid pignemted color like paint. According to Wikipedia, "The word "patina" comes from the Latin for "shallow dish"... Figuratively, patina can refer to any fading, darkening or other signs of age, which are felt to be natural or unavoidable (or both). The chemical process by which a patina forms is called patination, and a work of art coated by a patina is said to be patinated."
Rust Patina offers a reddish brown color in varying degrees to the product finish. As metal rusts, depending on the elements in the recycled steel, it can result in varying shades of red and brown, going from light to dark within the same space.
Blackened Iron Patina offers a dark bluish black color finish that resembles a piece of metal that has been blackened by the smoke of a fire, not a solid black color, but black in a mixture of shades blended together in varying degrees.
Copper Verdigris Patina is a beautiful finish that resembles an old copper penny with a mixture of vivid greens and reddish copper in varying shades. The word verdigris comes from the alteration of the word vert-de-Grèce which means Green of Greece.
Again, our patina finishes are topped with a clear coat to prevent any changes in the finish over time.
See a good example of the various Steel Wall Clocks with the three types of patina finishes here: http://www.westbysouthwestdecor.com/clocks-wall-c-120.html