The Declaration of Independence: A Conversation with a Conservator 

When Chief of Conservation Mary Lynn Ritzenthaler retired in July 2016, the last hands to have touched the Declaration of Independence left the National Archives:
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Along with conservator Kitty Nicholson, Ritzenthaler removed the Charters of Freedom from their earlier encasements to perform examinations and treatments in 2001. When the new encasements were returned to the Rotunda in 2003, the National Institute for Standards and Technology estimated that they will stay sealed for close to 100 years.