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References in classic literature ?
The blinds were partly drawn to darken the room, and Mrs.
Climate change has increased the growth of algae, which darkens the surface of the ice sheet and leads to more rapid melting as it reflects only 35 percent of solar radiation compared to the 90 percent reflected by white snow.
When switching from light-to-dark, the helmet darkens in 33 microseconds, or 1/30,000th of a second, one of the fastest reaction times available (by way of comparison, a human eye blink takes 3/10th to 4/10th of a second).
The fact that yellow chrome paint darkens under sunlight has been known since the early 19th Century.