Researchers have found that distinctive iridescent patina on an ancient Roman glass fragment stems from a photonic crystal structure that formed naturally within the material over time.

中文翻译：

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古罗马玻璃中随着时间的推移形成的光子晶体

研究人员发现，古罗马玻璃碎片上独特的虹彩铜绿源于材料内随着时间的推移自然形成的光子晶体结构。