Er:YAG laser cleaning of a marble Roman urn

IF 0.5 0 HUMANITIES, MULTIDISCIPLINARY

Journal of the Institute of Conservation Pub Date : 2020-01-02 DOI:10.1080/19455224.2019.1706593

A. Andreotti, M. Colombini, A. de Cruz

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引用次数: 8

Abstract

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.

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YAG激光清洗大理石罗马骨灰盒

摘要:很少有文献记载的使用Er:YAG激光清洗石质文物的实例;然而，文献报道的病例显示其在去除表面有机铜绿和地衣方面的有效性。一个具有考古意义的罗马大理石丧葬骨灰盒(公元67-100年)被一层坚硬的表层覆盖，掩盖了它精致的装饰雕刻。色谱质谱和拉曼光谱技术允许表征那些经历光氧化和生物变化的无机和有机材料，导致厚的外壳。采用脉冲长度为300µsec、波长为2940nm的Er:YAG激光清洗骨灰盒。进行了初步试验，影响范围为0.7至6.4J/cm2，并使用了各种润湿剂。激光清洗导致大理石表面足够干净，清除了不需要的厚沉积物。最后，该方法的灵敏度允许在大理石表面保留一层致密的草酸钙，以帮助保护它。

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来源期刊

Journal of the Institute of Conservation HUMANITIES, MULTIDISCIPLINARY-

CiteScore

1.50

自引率

0.00%

发文量

期刊介绍： The Journal of the Institute of Conservation is the peer reviewed publication of the Institute of Conservation (Icon). As such, its aims reflect those of Icon, to advance knowledge and education in conservation and achieve the long term preservation and conservation of moveable and immoveable cultural heritage. The Journal provides a collective identity for conservators; it promotes and supports both the profession and professionalism. With international contributions on all aspects of conservation, it is an invaluable resource for the heritage sector. The specific aims of the Journal are to: 1. promote research, knowledge and understanding of cultural heritage conservation through its history, practice and theory 2. provide an international forum to enable and disseminate advances in research, knowledge and understanding relating to conservation and heritage 3. champion and support professional standards of heritage conservation in the UK and internationally 4. provide a permanent record of issues relating to conservation and heritage 5. be financially and operationally sustainable. To achieve these aims, the Journal invites contributions from all those involved in the conservation of cultural heritage and related activities. Areas of interest include understanding cultural heritage materials and their degradation; subject reviews and histories of cultural heritage materials and conservation treatments; new, innovative or improved approaches to conservation and collections care theory, practice, communication, management and training; case studies demonstrating new, innovative or improved approaches; and conservation in its wider context. Submitters are encouraged to demonstrate how their work is of practical application to conservation. To maintain professional standards and promote academic rigour, submissions of articles and shorter notices are subject to an anonymous peer review process.