![]() ![]() The current binding, suitable for books on paper, is inadequate to a parchment support and has contributed to its deterioration, allowing the free movement of the skin according to humidity and temperature variations, which promotes detachment of the pigments another consequence is the free entrance of air content into the manuscript, allowing the contact with humidity, oxygen and atmospheric pollutants, such as hydrogen sulphide, which reacts with the silver, producing Ag2S. Another visible type of degradation occurs with the blue used in the decoration outside the illuminations, which has suffered partial or total detachment in most of the folios, as well as th e green and white colours. Some pigments are heavily degraded, such as minium and silver, having darkened and migrated to the back of the parchment other colours, like copper blues and greens, present a light migration. The pigments and other materials, such as gold and silver, are in consonance with the materials used in the 15th century. For colour analysis, it was used colorimetry on different areas of the folios, showing considerable differences between the most and least handled areas due to th e deposit of dirt and grime. In an overall analysis, 78% of folios were slightly damaged and 17% damaged. In a set of selected folios, the main damage signs were observed: surface contamination, deformation and discoloration of the parchment, damages in the illuminations and text. As an aid tool for the diagnostic of its conservation state, it was used the IDAP protocol (Improved Damage Assessment of Parchment). This prayer book, composed by illuminations and devotional texts, is in a bad condition due mainly to the rebinding done between 18th - 19th centuries. The “Cofre no.31” is a French 15th century book of hours from the Palácio Nacional de Mafra (PNM), in Portugal.
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