Black Hours, Bruges, c. 1470
This Book of Hours, referred to as the Black Hours, is one of a small handful of manuscripts written and illuminated on vellum that is stained or painted black.
The black of its vellum—the very thing that makes the codex so striking—is also the cause of some serious flaking. The carbon used in the black renders the surface of the vellum smooth and shiny—a handsome but less than ideal supporting surface for some of the pigments.
The anonymous painter of the Black Hours is an artist whose style depended mainly upon that of Willem Vrelant, one of the dominant illuminators working in Bruges from the late 1450s until his death in 1481.
Digital Facsimile at the source link.