The term GREEN COAT can be summarized by two crossword solutions: PATINA (6 letters) and DEW (3 letters). PATINA is a thin layer of oxidation that forms on the surface of metals, giving them a greenish hue. It is often seen on copper and bronze objects, and can also form on other materials such as stone. DEW is a type of condensation that forms when warm air comes into contact with cooler surfaces. It is often seen in the early morning hours, when the sun has not yet risen and the air is still cool.