Understanding the degradation of the blue colour in the wall paintings of Ariadne's house (Pompeii, Italy) by non‐destructive techniques,Journal of Raman Spectroscopy

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Understanding the degradation of the blue colour in the wall paintings of Ariadne's house (Pompeii, Italy) by non‐destructive techniques
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-07-12 , DOI: 10.1002/jrs.5941
Nagore Prieto‐Taboada ₁ , Silvia Fdez‐Ortiz de Vallejuelo ₂ , Anne Santos ₂ , Marco Veneranda ₃ , Kepa Castro ₂ , Maite Maguregui ₄ , Héctor Morillas ₅ , Gorka Arana ₂ , Alberta Martellone ₆ , Bruno Nigris ₆ , Massimo Osanna ₇ , Juan Manuel Madariaga _{2,

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Affiliation

Ariadne's house is in the Regio VII of the Archaeological Park of Pompeii (Italy). As it is exposed to external alteration agents (rainfall, water infiltration and atmospheric pollution), the mural paintings located in this important residence clearly show the effects of ongoing degradation processes. This is especially the case of Room 22 (also called the blue room), where the original blue decorations varied towards greyish green hues. In situ and laboratory spectroscopic analyses by means of non‐destructive X‐ray fluorescence, infrared and Raman spectroscopies identified the original pigments and the materials used in the conservation works. Looking in detail at the stratigraphic distribution of the original pigments, using Raman spectroscopy, an inner layer of Egyptian blue mixed with celadonite was detected under a layer of pure Egyptian blue. This discovery proves the presence of a more ancient painting below the one that can be observed today. Considering that celadonite was an inexpensive pigment (thus, probably used to reduce the costs of the paintings), this information strengthens the hypothesis that based on archaeological evidences, there is evidence of an evolution of the socio‐economic status of the ancient owners of the residence. In addition to that, Raman data also proved the occurrence of salt efflorescences; they provided insights about the compromised conservation state of the wall paintings, and they highlighted the action of atmospheric acid gases as an important factor.

中文翻译：

通过非破坏性技术了解Ariadne房屋（意大利庞贝）的壁画中蓝色的降解

Ariadne的房屋位于庞贝（意大利）考古公园的雷焦七世（Regio VII）。由于它暴露于外部改变剂（降雨，水渗透和大气污染）下，位于这个重要住所的壁画清楚地显示了正在进行的降解过程的影响。特别是22号房（也称为蓝色房）），原始的蓝色装饰随灰绿色调而变化。通过非破坏性X射线荧光的原位和实验室光谱分析，红外光谱和拉曼光谱确定了原始色素和保护工作中使用的材料。详细查看原始颜料的地层分布，使用拉曼光谱法，在纯埃及蓝层下检测到埃及蓝和青瓷混合的内层。这一发现证明了在今天可以观察到的一幅画之下存在着一幅更古老的画。考虑到青瓷是一种廉价的颜料（因此，很可能用于降低绘画成本），因此该信息强化了基于考古证据的假设，有证据表明，该住所的古代所有者的社会经济地位正在演变。除此之外，拉曼数据还证明了盐风的发生。他们提供了关于壁画受损的保护状态的见解，并强调了大气酸性气体的作用是一个重要因素。

更新日期：2020-07-12

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