Plato's three colors for Atlantis
The stone which was used in the work they quarried from underneath the centre island, and from underneath the zones, on the outer as well as the inner side. One kind was white, another black, and a third red, and as they quarried, they at the same time hollowed out double docks, having roofs formed out of the native rock.
Critias - by Plato [360 BC]
White, red and black the colors named by Plato as the colors of Atlantis!
Thanks to "justinjbrown" and "hunchback" at the Gnostic Media forum for this info.