...obscurecer, to obscure, blind, darken, grow dark; refl... 
Gustavo Adolfo Becquer 「Legends, Tales and Poems」
...The haycocks dotted the ground with their yellowish cones, now beginning to darken and take on a tone of oxidized gold...
Vicente Blasco Ibanez Charlotte Brewster Jordan 「The Four Horsemen of the Apocalypse」
...After maturity they are apt to darken considerably, though not inall specimens...
Harrison Weir 「Our Cats and All About Them」
...A fortnight after the egg is laid two large eye-marks, round and of areddish black, are seen to darken the forward extremity of the egg...
J. H. Fabre Bernard Miall 「Social Life in the Insect World」
...We cannot say as much of the larger kinds, which sometimes darken the air, by their abundance, in hot climates...
Samuel Griswold Goodrich 「Illustrative Anecdotes of the Animal Kingdom」
...Muriate of ammonia precipitates chloride to darken to a fine chocolatebrown, whilst muriate of lime produces a brick-red color...
Henry H. Snelling 「The History and Practice of the Art of Photography」
...Similarly, if a yellow ochre be but partiallycalcined, the red so obtained is apt to deepen or darken...
George Field 「Field's Chromatography」
...They have a tendency to darken by time, drywell as a rule in oil, and are all more or less poisonous, even thosenot containing arsenic...
George Field 「Field's Chromatography」
...Slowly, they began to fill out and darken, as they drew in the fumesthat were more than bread and meat and water to us...
Various 「Astounding Stories, April, 1931」
..."You seriously propose to darken the greater part of eastern NorthAmerica?" asked the Secretary for War...
Various 「Astounding Stories of Super-Science, October, 1930」
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