The state of preservation of outdoor bronze sculptures in Göteborg, Sweden, was studied. Fourteen sculptures produced from 1869-1991 were visually inspected, and patina samples were analyzed using x-ray diffraction. Patina layers exhibited areas of different color and structure which were classified and described in terms of appearance and composition. The crystalline corrosion products detected included cuprite, antlerite, brochantite, atacamite, paratacamite, and a novel copper hydroxysulfate, Cu_2.5(OH)₃SO₄.2H₂ </sub>O. A greenish hue was discernible on a bronze sculpture after two years of outdoor exposure. Copper hydroxychloride was the first crystalline corrosion product detected after one decade exposure. After three decades the copper hydroxysulfate brochantite was detected and also light-green horizontal areas in combination with vertical streaks. Black crusts were observed on sculptures older than four decades. All sculptures examined retained some parts which revealed the original surface morphology and tool marks. It is proposed that a conservation program for maintenance of new sculptures be prepared.