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 result is quite arresting. The text is written in silver and gold, with gilt initials and line endings composed of chartreuse panels enlivened with yellow filigree. Gold foliage on a monochromatic blue background makes up the borders. The miniatures are executed in a restricted palette of blue, old rose, and light flesh tones, with dashes of green, gray, and white. The solid black background is utilized to great advantage, especially by means of gold highlighting. The artist was a follower of Guillaume Vrelant and influenced by Philippe de Mazerolles and Liévin Van Lathem.