Answer: patine

AnswerCrossword Clue
PATINECoat in a green film
PATINEFilm on bronze: Var.
PATINEFilm on copper: Var.
PATINERich surface appearance: Var.
PATINEGreen film on bronze
PATINECopper coating: Var.
patinepatina
patineto cover with a patina