Purple--This is made with Prussian blue, or indigo and red. Carmine and Prussian blue producing the richest color, which may be deepened in the shadows by a slight addition of indigo or brown.英文原著 · 《The History and Practice of the Art of Photography》
WILD INDIGO; YELLOW or INDIGO BROOM; HORSEFLY-WEED (Baptisia tinctoria) Pea family英文原著 · 《WILD FLOWERS》
It was curiously alluring, though not exactly beautiful. Her hair was clustering and boyish, reaching only to the neck. It was of a strange indigo colour. She was quaintly attired in a tunic and breeches, pieced together from the square, blue - green plates of some reptile. Her small, ivory-white breasts were exposed. Her sorb was black and sad - rather contemplative. Without once glancing up at Oceaxe and Maskull, she quietly glided straight toward Crimtyphon's corpse. When she arrived within a few feet of it, she stopped and looked down, with arms folded.英文原著 · 《A Voyage to Arcturus》
Chromatic Aberration is another difficulty that opticians have to contend with in the manufacturing of lenses. It will be remembered, that in a former page (133) a beam of light is decomposed by passing through a glass prism giving seven distinct colors--red, orange, yellow, green, blue, indigo and violet.英文原著 · 《American Hand Book of the Daguerreotype》
The Wrens, the Woodpeckers, the Flycatchers, the Warblers, Purple Finch, the Cuckoos, Brown Thrasher, Wood Thrush, Cowbird, Brown Creepers, the Nuthatches and Titmice, the Kinglets, Chewink; the White-crowned, White-throated, Tree, Fox, and Song Sparrows; Humming-bird, Bluebird, Junco, the Crossbills, the Grosbeaks, Nighthawk, Whippoorwill, Mourning Dove, Indigo Bird, Brown Thrasher.英文原著 · 《Bird Neighbors》