»pentimento

pentimento describes the underlying image in a painting, often indicating that the painter changed part of the composition. Jan van Eyck's Arnolfini Portrait is a famous example.

The word comes to English directly from the Italian term for "correction", which itself comes from the Latin verb pēnitēre, to repent. This is telling! It brings to mind penitenziagite, famously used in Umberto Eco's The Name of the Rose. The heretical monk Salvatore uses this vivid term as a rallying cry. Lillian Hellman chose "Pentimiento" as the title for her collection of autobiographical essays.