...The very young babies havenot black but light-coloured faces, which darken afterwards... 
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...a small incision was made in the end of the finger, which by this time was beginning to darken at the point of venom deposition...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...They come flying in swarms that darken the sun, and they settle on thetrees and the crops and eat up every green thing...
Margaret Warner Morley 「The Insect Folk」
...Thismethod will lighten or darken a tone in varying degree, accordingto whether the lines are thick, thin, or gradated—somewhat inthe same way that lines of shading are drawn in line work...
Harold Speed 「The Practice and Science Of Drawing」
...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」
...Look to it;Consider, William: take a month to think,And let me have an answer to my wish;Or, by the Lord that made me, you shall pack,And never more darken my doors again...
Alfred, Lord Tennyson 「The Early Poems of Alfred, Lord Tennyson」
...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」
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