The "Black Hours"

The “Black Hours,” an illuminated prayer book crafted in Bruges, Belgium, in the 15th century, is one of the rarest medieval manuscripts ever produced.
The “Black Hours” was made by dyeing vellum parchment with iron gall ink, resulting in dark tones.
Preserved pages from the “Book of Hours” show an illumination technique that featured gold and silver lettering and rare ultramarine pigment worth more than gold.
One of the most mesmerizing illustrations is found on folio 14v, titled “The Crucifixion,” where Jesus is shown on the cross with multiple wounds and with St. John standing next to him.

Marginalia on the "Black Hours"