The Black Hours: Material and Conservation Study, Part 1
The Book of Hours of Galeazzo Maria Sforza, V. Duke of Milan (Vienna, Austrian National Library, Codex 1856), the so-called Black Hours, is a Flemish illuminated manuscript with silver and gold ink on black coloured parchment from the third quarter of the fifteenth century. The severe deterioration of the parchment by the black colourant resulted in brittleness and numerous losses. This paper desc