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Related to darkening: Limb darkening
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It's long been hypothesized that there's a mystery darkening agent that's contributing to Mercury's low reflectance," said Megan Bruck Syal, a postdoctoral researcher at Lawrence Livermore National Laboratory who performed this research while a graduate student at Brown University.
From the Borders upwards, you should get this noticeable darkening.
The objective of scientists at the University of Maine was to evaluate the effectiveness of sodium acid sulfate (SAS) dip treatments, compared to other anti-graying treatments and a control, to see how effective SAS would be in reducing after-cooking darkening in boiled Katahdin potatoes.
The researchers paid close attention to the colour of the spots, which are known to gradually change colour from a sienna brown to a coal black, beginning with a darkening in the centre of the blotch that slowly extends outward to the edges.
A DARKENING GREEN: NOTES ON HARVARD, THE 1950S AND THE END OF INNOCENCE is drawn mostly from a diary the author kept while he was a freshman at Harvard in the 1950s, describing the experience of late adolescence and offering a narrative of freshman college experience perfect for any college library.
The reasons for the dramatic darkening still are under investigation.
Other features include a touch pad for managing an XGA connection, brightening or darkening images, switching between a positive and negative image, mirroring or freezing images, controlling the iris and creating split screen images.
In general, eumelanin plays a role in darkening the skin.
To darken, or "burn" selected areas, make the Foreground color black and paint those areas that need darkening with smooth strokes.
Clairju (INCI name Hydrolyzed Prunus Domestica), an extract derived from prunes, inhibits skin darkening by decreasing the appetite of keratinocytes for the melanin-producing melanocytes.
Dower describes a condition of exhaustion and despondency in Japan immediately after the war, causing people to prefer an earlier darkening so they could escape into sleep or drink.