Crossword Genius

Oxidation film found on copper or bronze (6)

Ross

I believe the answer is:

patina

(Other definitions for patina that I've seen before include "Gloss or colour produced by a paint" , "Distinctive surface acquired over time" , "Surface film formed by age" , "Sheen produced by age and polishing" , "thin coating" .)

I've seen this clue in The Telegraph.
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