Colour: A particular shade of red. To be precise, the range of colours around CIE chromacity x 0.41, y 0.27 to 0.33; depending on your hardware, they look something like:
... of Utrecht in St. Michael's Church,
Zwolle, Nov. 11, 1897.
Thomas ā Kempis belonged to the school of
mystics who were scattered along the Rhine from
Switzerland ...