Revelation and concealment are the two tasks performed most by restorers—both today and historically. Removing dirt and non-original materials to uncover the true intention of the maker but also the bare facts of condition, is standard procedure. Following this process of revelation, restorers often compensate for damage by retouching areas to conceal loss and to restore visual unity to the whole. During the National Socialist period (1933–45), restorers twisted their familiarity with the practice of revelation and concealment to serve other ends. They engaged in ideological ‘revelation’ through the physical preservation of looted works of art and also helped to conceal the fact that many of these works had been stolen from victims of the regime. They also sought to conceal their involvement with criminal objectives through the minimisation of their roles or the erasure of their status under the regime. Such acts of revelation and concealment, both physical and intellectual, were fully documented both intentionally and unintentionally. Through their work, restorers conspired with the Nazi regime to aid and abet criminal acts. Their rewards were rich. But their reputations have largely remained unsullied.