Patina is the way metal shows its aging gracefully, or so I say. It is an outer layer that forms due to the chemical processes and physical experiences of metal; in many cases creating a beautiful and protective barrier. It varies in colors of green, golden and blue and many find it to be preferable to the original metals color, as it is considerably more unique. True patina requires the uncontrolled matter of time... or a good dousing of table salt.
Metal Colouring and Bronzing
(image source)
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