page_title: Sala delle Asse
section_title: Activities  
hierarchical_section_title: Sala delle Asse / Current restoration / Activities  
caption_attribution_description: English: UV fluorescence on the monochrome
context_page_description: The Sala delle Asse, is the location for a wall and ceiling painting in tempera on plaster, of decorated "intertwining plants with fruits and monochromes of roots and rocks", by Leonardo da Vinci, dating from about 1498 and located in the Castello Sforzesco in Milan.
context_section_description: Various activities have been performed since 2012
  Archive digging: relevant documentation has been brought to light or put in the proper perspective. The material included original letters (from the time of the original painting of the room), to historical documentation about the castle, and also about the two previous restorations.
  Architectural historical analysis: investigating all the historical events leading to the current situation of the room. Several alteration of the past openings in the room were detected, and properly framed within the history of the castle.
  Technical diagnostics: several modern diagnostic techniques have been used.
  Thermography (detecting differences in temperature on the walls) was used to identify alteration in the building of the rooms (since different materials have different temperatures).
  Laser beams were used to precisely build a 3D model of the room.
  UV fluorescence was used to detect various layers of painting. Ultraviolet light, in fact, can be used to detect the different “organic binders” of paint, i.e. the organic substances (e.g. eggs) used to keep the colors stable. These binders were different from Leonardo time, to later periods and to the previous restorations.
  Spectroscopy (in the Infra-Red range) has been used to detect the various “inorganic binders” used for painting, at various times.
  Artistic analysis: A careful analysis of various documents and results from diagnostics, has allowed to better understand the various events and actions that have brought the castle (in general) and Sala delle Asse (specifically) to the current situation.
  Restoring drawings and paintings
  Careful “peeling off” of layers has allowed to uncover older layers. This has been especially relevant for bringing to light the monochrome, currently considered the oldest layer of decoration in the room. It is likely that it was directly due to Leonardo himself.
caption: UV fluorescence on the monochrome
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