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<p>The study investigates acetic salt efflorescence, a common issue in museums that damages artifacts exposed to acetic acid vapors. White efflorescent crystals on two Han Dynasty Eaves Tiles from the National Museum of China were analyzed using optical microscopy, SEM, Raman spectroscopy, and FTIR. The analysis identified thecotrichite (Ca₃(CH₃COO)₃Cl(NO₃)₂·6H₂O), formed through the reaction of acetic acid with residual chlorides, nitrates, and calcareous components in the tiles. A tailored desalination approach was employed: the cracked “Hanbingtianxia” tile was treated with a poultice method, while the intact “Changlewuji” tile underwent static water immersion. The process was meticulously monitored using conductivity measurements and ion chromatography to ensure optimal results. Acid-free storage cartons and humidity control were implemented to prevent efflorescence recurrence, confirming the success of the preservation strategies.</p>

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Accurate identification and extraction of acetate salts on Han Dynasty Eaves Tiles in museum environment

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月9日

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  • Na Zhao,
  • Ran Zhang,
  • Lei Lei,
  • Qin Yang

摘要

The study investigates acetic salt efflorescence, a common issue in museums that damages artifacts exposed to acetic acid vapors. White efflorescent crystals on two Han Dynasty Eaves Tiles from the National Museum of China were analyzed using optical microscopy, SEM, Raman spectroscopy, and FTIR. The analysis identified thecotrichite (Ca₃(CH₃COO)₃Cl(NO₃)₂·6H₂O), formed through the reaction of acetic acid with residual chlorides, nitrates, and calcareous components in the tiles. A tailored desalination approach was employed: the cracked “Hanbingtianxia” tile was treated with a poultice method, while the intact “Changlewuji” tile underwent static water immersion. The process was meticulously monitored using conductivity measurements and ion chromatography to ensure optimal results. Acid-free storage cartons and humidity control were implemented to prevent efflorescence recurrence, confirming the success of the preservation strategies.