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Tenebrescence, also known as reversible photochromism, is the ability of minerals to change colour when exposed to sunlight. The effect can be repeated indefinitely, but is destroyed by heating.
Additional recommended knowledge
Tenebrescent behavior is exploited in synthetic materials for the manufacture of self-adjusting sunglasses, which darken on exposure to sunlight.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Tenebrescence". A list of authors is available in Wikipedia.|