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Er:YAG laser cleaning of a marble Roman urn
Journal of the Institute of Conservation Pub Date : 2020-01-02 , DOI: 10.1080/19455224.2019.1706593
Alessia Andreotti , Maria Perla Colombini , Adele De Cruz

Abstract There are very few documented instances of the use of an Er:YAG laser in the cleaning of stone artefacts; however, the cases reported in the literature have shown its effectiveness in the removal of surface organic patinas and lichens. A Roman marble funerary urn (67–100 AD) of archaeological importance was covered with an intractable surface layer that obscured its delicate decorative carving. Chromatographic mass spectrometric and Raman spectroscopic techniques allowed the characterisation of those inorganic and organic materials that had undergone photo-oxidation and biological changes, resulting in the thick encrustation. An Er:YAG laser at 2940nm, with a pulse length of 300µsec, was used for cleaning the urn. Preliminary tests were performed with fluences ranging from 0.7 to 6.4J/cm2 and in the presence of a variety of wetting agents. The laser cleaning resulted in a sufficiently clean marble surface with the thick deposit of unwanted material removed. Finally, the sensitivity of the method allowed for a compact layer of calcium oxalate to be retained on the marble’s surface to help protect it.

中文翻译:

:: YAG激光清洗大理石罗马缸

摘要很少有文献记载用Er:YAG激光清洁石材制品的案例。然而,文献报道的病例显示了其在去除表面有机铜锈和地衣方面的有效性。具有考古重要性的罗马大理石marble葬缸(公元67至100年)上覆盖着一层难以处理的表层,掩盖了其精美的装饰性雕刻。色谱质谱和拉曼光谱技术可以表征那些经历过光氧化和生物变化,结成厚壳的无机和有机材料。使用2940nm的Er:YAG激光清洁脉冲缸,脉冲长度为300µsec。在各种润湿剂的存在下,通量范围为0.7至6.4J / cm2进行了初步测试。激光清洁可以使大理石表面充分清洁,去除掉厚厚的多余物质。最后,该方法的灵敏性使得草酸钙的致密层能够保留在大理石表面上,从而有助于保护大理石。
更新日期:2020-01-02
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