(1) The Guennol Triptych
The colours in the swatch were inspired by the Guennol Triptych which was included in the Becket Exhibit at the British Museum.
“The importance of reliquaries in the church is witnessed by their place in the liturgy, and by the requirement of holy relics for the consecration of an altar and, therewith, of the church building. Such was the popular appeal of relics, that, despite official disapproval, their veneration often transcended the bounds of proprietary to extremes of idolatrous intensity.”
Source: The Guennol Collection Volume 1
(2) A scan from the Art and Craft of Stained Glass by E.W. Twining.
Plate III: A Sketch by Messrs. Clayton & Bell
No. 3912, Class No. D993