National Geographic : 1924 Mar
THE STARTING POINT OF THE BLUE DRAGON LAVA FLOW Perhaps the strangest features of this flow are its color and texture. Its tint is a deep cobalt blue,with aglossy finish, resembling varnish or enamel. The coating averages one-fourth of an inch in thickness. The play of light and shadow at sunset turns this formation into atwisted, wavy sea of grays, purples, blues, and blacks (see also illustration, page 322).