Detail from previous photo: chalice roundel

Quarry stained glass window with a grisaille background and stained glass chalice

"In 1134 the ascetic Cistercian order had forbidden in its own churches the use of coloured or figured glass ... Not only was it cheaper but it also let in more light. Such glass was mainly white, thinly painted in outline with black foliage patterns. Sometimes spots of coloured glass were added to give variety ... This type of glass was known as 'grisaille.'

" ... between the 13th and 14th centuries ... often grisaille painting is found on diamond-shaped panes known as 'quarries.' " - Pitkin Guide: Stained Glass