Columbia subject headings:
Art, Medieval--Congresses.
Color in art--Congresses.
Polychromy--Congresses.
Harvard subject headings:
Art, Medieval--Congresses
Color in art--Congresses.
Polychromy--Congresses.
Princeton subject headings:
Art, Medieval--Congresses.
Color in art--Congresses.
Polychromy--Congresses.