copper roof on the minneapolis city hall
, coated with patina
the dresden frauenkirche
. the church was destroyed during the bombing of dresden
in 1945 and then rebuilt from 1993 to 2005 with new material; the stones with the black patina are the parts that survived the firebombing from the original 18th-century church.
pre-colonial copper coin formerly used in the copper belt
(democratic republic of the congo
). the external layer has been weathered by moisture and rain, leading to the oxidation of copper.
patina (/ or /) is a thin layer that variously forms on the surface of copper, brass, bronze and similar metals (tarnish produced by oxidation or other chemical processes), or certain stones, and wooden furniture (sheen produced by age, wear, and polishing), or any similar acquired change of a surface through age and exposure.
additionally, the term is used to describe the aging of high-quality leather. the patinas on leather goods are unique to the type of leather, frequency of use, and exposure.
patinas can provide a protective covering to materials that would otherwise be damaged by corrosion or weathering. they may also be aesthetically appealing.