Description: [caption id="" align="aligncenter" width="360" caption="Steven Cohn, the Smithsonian’s Office of Safety, Health and Environmental Management and the museum’s representative Industrial Hygienist, tests Owney's fur for arsenic, lead and mercury. Courtesy of the National Postal Museum "Pushing the Envelope" blog."][/caption] More interesting preservation challenges. We’ve covered
Description: [caption id="" align="alignright" width="210" caption="Portrait of a City Marshal by Barr & Wright, 1870-1880, National Museum of American History, Catalog number 77.43.1678."][/caption] Help the Smithsonian ID a Houston city marshal from the 1870s in the picture on the right. The extremely flammable nitrocellulose film used before 1951 led to an estimated 80 percent of silent