Word: pigment
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Reason: carotene, a yellow pigment occurring in association with chlorophyll in green plants, is transformed by the body (probably the liver) into vitamin A, which insures sharp human vision at night...
...Sage Carver still sticks to his philosophy: "Save everything. From what you have make what you want." His gnarled hands are always busy with bits of string, tinfoil, clay, which he fashions, as he talks, into decorative objects. He is proudest of his picture of four peaches, painted with pigment made of native clay, not as a work of art but because any child, as a result of his researches, should be able to use similar material. "That's just the clay we walk on every day." says he. " Our clays are just as brilliant as the ones...
...arabic) is mixed with water in painting, is fast-drying, cheap and simple to use. Gouache painters need neither easels, oil, turpentine nor expensive canvas, can paint conveniently on anything from paper to wallboard. Unlike watercolor, where the texture of the paper shows through the paint, the pigment in gouache is opaque, sticks out from the surface of the paper as oil paint stands out on canvas...
When the deciduous (non-evergreen) leaf begins to die and disintegrate, the molecules of its unstable green pigment, chlorophyll, disappear. Its departure reveals the yellow carotene and xanthophyll which have been present but masked by the green all summer...
While museum visitors watched, Charley Turquoise and his helper squatted in the sand, crosslegged, smoothed it carefully with a long paddle, began carefully covering it with colored pictures of angular, oblong-bodied gods and animals. Their pigment, which they lifted in handfuls from five different bowls beside them, was powdered rock and charcoal-white, blue, yellow, black and red. Trickling each handful in a fine stream between thumb and forefinger, they drew lines and wedge-shaped patches as accurately as draughtsmen, pinched off a dot or a spot of color here & there as featly as if they were salting...