pa·ti·na /pəˈtinə, ˈpætənə/
  綠鏽,光澤,古色
  pat·ina n.
  1. A dish or plate of metal or earthenware; a patella.
  2. Fine Arts The color or incrustation which age gives to works of art; especially, the green rust which covers ancient bronzes, coins, and medals.
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  patina
       n : a fine coating of oxide on the surface of a metal
       [also: patinae (pl)]