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有些物质在一定波长的光照射下,能改变颜色,而在暗处或在波长较长的光照射下或受热,又恢复原色,这类可逆现象就是光致变色(光色互变过程)。
Some substances can change their color when exposed to light of a certain wavelength, and then recover their original color when exposed to dark or long-wavelength light or heat. Such reversible phenomenon is photochromism.