In the past, the leather used as wall decoration or as a painting support enjoyed periods of success and sometimes great splendor. At the Italian Central Restoration Institute (ICR) in Rome, the Leather Section has embarked on a project to develop a registration system for technical data. Such data will contribute to better knowledge of the few objects that are still extant, forestall the virtually total dispersion of unknown or unrecorded works, and suggest directions for future research. A brief description and a few examples of the registration form are given. Complementing the forms, a technical lexicon and a collection of graphic and photographic documents are supplied. -- CAL