From Art Knowledge News:

Annunciation Diptych Jan van Eyck 1436 Oil on panel Thyssen-Bornemisza Museum

15th century illuminated manuscript in grisaille

Jan Van Eyck 's Annunciation Diptych , housed in the permanent collection of the Thyssen -Bornemisza Museum in Madrid, will be included in their special exhibition featuring 14th and 15th century works made using the technique of grisaille