Senior conservator of paintings Ann Hoenigswald works to fill in elements of Paul Cézanne's Riverbank c. 1895 in the National Gallery of Art's Paintings Conservation Lab in Washington, D.C.

Michael Swicklik works to clean up the yellowed layers of Fra Angelico's The Entombment of Christ, c. 1450.

Senior conservator of paintings Michael Swicklik.

Head of painting conservation Jay Krueger's restoration supplies as seen at work station

intern Kathryn Harada carefully removes layers from Jean-Baptiste-Camille Corot's Gypsy Girl with Mandolin, c. 1870.

Jay Krueger, head of painting conservation, sits next to one of his recent conservation efforts, Mark Rothko's Untitled, 1969.