出典:Wiktionary
tenebrescence (usually uncountable, 複数形 tenebrescences)
出典:Wikipedia
出典:『Wikipedia』 (2011/05/11 15:33 UTC 版)
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.
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