故宫博物院研究馆员、古建专家周乾新书《坐在故宫屋檐下：图解紫禁城五十问》近日新鲜出炉。

周乾这部新书因为破除了不少关于故宫的错误传言，而颇为引人关注。

Zhou Qian, a senior researcher and ancient architecture expert of the Palace Museum, has published a new book which has drawn wide attention for debunking many long-standing myths about the Palace Museum.

关于“故宫每年用60吨猪血镇邪”传言，周乾澄清道：“故宫木构件的地仗层中确实含有猪血成分，但猪血并非用于镇邪，而是作为黏合剂，与砖灰、桐油、麻等材料调和成灰浆，包裹在木构件表面，防止木材遭受日晒、雨淋、虫咬。”猪血中的蛋白质在碱性环境下分解，与灰浆中的钙离子交联，“能提高地仗层的粘接性能与耐久性，这是古代工匠的科学创造。”

Regarding the rumor that 60 tons of pig blood is used annually at the Forbidden City to ward off evil, Zhou Qian clarified that pig blood is merely an adhesive in the plaster coating on ancient wood structures. Mixed with brick dust, tung oil and hemp, it protects wooden structures from weathering and pests. Its chemical properties enhance adhesion and durability, showing the scientific wisdom of ancient craftsmen.

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有网友表示，原来不是玄学，是科学啊！

来源：光明网 北京日报微博 都市现场

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