pentimento
noun
- Art the emergence of lines, images, etc. in a painting that become visible as oil paint grows transparent with age, thus revealing the artist's earlier ideas
- pl. pentimenti any such line, image, etc.
See pentimento in American Heritage Dictionary 4
(pĕnˌtə-mĕnˈtō)
noun pl. pen·ti·men·ti (-tē) An underlying image in a painting, as an earlier painting, part of a painting, or original draft, that shows through, usually when the top layer of paint has become transparent with age.