1. Department of Materials Science and Engineering; UCLA; Los Angeles CA 90095-1595 USA
2. Conservation Center; Los Angeles County Museum of Art; Los Angeles CA 90036 USA
3. Renishaw Inc.; Spectroscopy Products Division; 5277 Trillium Blvd. Hoffman Estates IL 60192 USA
4. UCLA/Getty Conservation Program; Cotsen Institute of Archaeology, UCLA; Los Angeles CA 90095-1510 USA