Cindy Connelly Ryan is a cultural heritage science specialist at the Library of Congress, with a background in physics (Carnegie-Mellon University), art history and art conservation (New York University). She held a Forbes Fellowship at the Freer/Sackler Galleries of the Smithsonian Institution before joining LC-PRTD. Her research at LC has included development of acellerated aging and analytical methods, assessment of book and paper conservation materials and methods, particularly stabilization treatments for iron gall ink and verdigris, and the alteration chemistry of verdigris in aqueous media. Current work centers on MFT method development, reconstruction of historic inks, paints, and dyes, non-invasive identification of organic colorants, and technical studies of collection items.