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为何木简从井里发掘出来会变黑？专家揭秘
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从井里发掘出来的木简，环境里带的铁离子等元素会渗透到木简中，而木材中又有无色发色基团，见到氧气和紫外光后在重金属离子催化的情况下就会慢慢变成黑色。（视频来源：CCTV 纪录）
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