"Black patina" refers to a dark or black coating that forms on surfaces, especially metals, over time due to oxidation or chemical reactions. Full definition
This selection of his works in bronze, all of them finished in his signature black patina, provides a comprehensive view of his -LSB-...] (minusspace.com)
Six feet tall sculptures blanketed by black patina contain the flexible rotundity and optic completeness, yet their magnificent presence and clear - cut industrial precision amaze the viewers standing aside. (artspeak.nyc)
Shinique Smith's «Bale Variant No. 0023 (Totem)» (2014), made of colored fabrics massed into a column, has a singular presence while Brenna Youngblood's noble sculpture «X,» (2012) made of «tree» — wood tinted in soft black patina — is quietly provocative, suggesting simultaneously Malcolm X and the conventions of modernism. (kcrw.com)