Philadelphia's City Hall sculptures back on display after laser cleaning

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Eight bronze sculptures by Alexander Milne Calder have been returned to their places on top of Philadelphia's City Hall after the completion of a major conservation project. The project, which cost over $2 million and took three and a half years to complete, was carried out by a Chicago sculpture conservation studio and by the Philadelphia Museum of Art. The sculptures were painstakingly laser cleaned to remove grime from atmospheric pollution; this is the first conservation project on a major scale to use laser cleaning technology.

Philadelphia completes groundbreaking restoration of Alexander Milne Calder sculptures atop City Hall -- Media Newswire

City Hall's Calder sculptures beaming after laser cleaning -- Philadelphia Inquirer

Philadelphia Museum of Art website

The Conservation of Sculpture and Objects Studio website