"Pauline in a white dress," which was probably painted in the early 1800s, is attributed to German painter Phillip Otto Runge. | Matthias Alfeld/University of Antwerp

Blonde to Brunette: X-rays Reveal Artist's Switch

X-rays reveal artist switch. Learn more about x-rays revealing an artist's switch in this article.

April 3, 2011
3:00 AM EDT