Hi Jim,
Thank you as much as always for your brilliant thoughts.
From all my studies, as I have often tried to point out in several posts, all I can tell for sure is that red and green unquestionably were the main colors of at least the Romanic (ca. 950-1200) and Gothic (ca. 1200-1500) art periods.
With all my very best wishes,
Michael, bidding you a very good night out there on route 66 !