@530 mark the blue mixed in the painting sparkles when the light was shone on it and the guy say it was the azurite found in Arizona.
In the spring of 1946 an explorer-photographer named Giles G. Healey entered the desolate frontiers of northern Chiapas. Healey passed through one of the entrances and entered a narrow, steeply vaulted room. As his eyes adjusted to the chamber's faint illumination, he was suddenly aware of count- less faces peering at him from the walls and ceiling. A moment later they had assumed sharp delineation and colors faintly muted by age. He was surrounded by processions of lavishly costumed priests and nobles, attended by servants and warriors. Entering the next room, he came upon a tableau of opposing armies locked in battle brown-skinned warriors en- tangled in confused attitudes of combat. Still more figures dancers in wildly exotic costumes covered the walls of the third room. What Healey had stumbled upon was actually a dazzling array of murals completely covering the walls of the temple's three interior chambers. http://www.rcquinn.com/bonampak/ Great Article with vivid pictures in color.