The Morgan Library & Museum, New York, MS M.493
The Black Hours
The production of a manuscript on black parchment was extremely costly and delicate. In a first step the parchment was immersed in an iron copper solution to obtain the black colouring, before it was painted.
The immersion in black colour was however, detrimental to the quality of the manuscript in the long rund as the dye made the parchment fragile and brittle.