Pentimento

The companion of this picture is the Madonna dressing the Infant, with Joseph planing a board in the back-ground; a performance though inferior in style to the former, not less original from the pentimenti still discoverable in the two principal figures.

She thought of the painting in the shop, the pentimento. Her life, the one she had so carefully planned for herself had crumbled like the paint on the surface.

[T]he presence of a pentimento is an extremely valuable entity which supports the conclusion that a painting is an original composition – so, by inference, therefore, refuting any later suggestion that the painting could be the work of a copyist, who would have been engaged upon copying an existing painting as seen! The identification of a pentimento in an artwork can occur in one of two ways: by analytical interrogation of the subsurface using penetrative radiation such as IRR or XRD, or by direct visual observation, where the overlaying paint has worn away […]