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Microscopic techniques to study Roman renders and mural paintings from various sites

机译:显微技术研究来自各个地点的罗马渲染和壁画

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Based on recent research on mural paintings from a number of ancient Roman sites, i.e. Ostia, Ephesos, Camuntum and Saalfelden, the contribution presents the results obtained by microscopic techniques used to study similar paints from different sites as well as paints of different artistic quality, style and date from one and the same site. It is shown that careful microscope investigations are capable of detecting the stratigraphic sequence of plaster layers, the way of preparing and applying the mortars, the raw materials used, and the means to produce the desired surface in terms of colour and texture. The analyses focus on petrographic thin-sections observed in different modes of illumination. Pseudocoloured images produced from characteristic sample micrographs are presented in order to better illustrate the relevant features. The preparatory — arriccio-plaster layers always contain aggravate from local sources, preferentially unwashed river sands with enhanced amounts of silt. For the finish — intonaco-plaster layers, the aggregate was produced by crushing selected stone material of light colour; when available or appropriate, marble was employed, but other stones can be found as well. For high quality paints, a number of intonaco layers were applied always using the same raw materials at reduced grain sizes and eventually admixing pigments. While this was the usual way to produce a smooth surface, a few examples were found which indicate grinding of the hardened intonaco prior to painting. The microscopic aspect of the paint layers clearly point to the application of a lime-pigment colour onto a dry or semi-dry surface, i.e. no true fresco technique was used.
机译:基于对来自多个古罗马遗址(例如Ostia,Ephhesos,Camuntum和Saalfelden)的壁画的最新研究,该文稿提出了通过显微镜技术获得的结果,这些技术用于研究来自不同地点的相似涂料以及具有不同艺术品质的涂料,一个网站的样式和日期。结果表明,仔细的显微镜研究能够发现灰泥层的地层层序,灰浆的制备和使用方法,所用的原材料以及在颜色和纹理方面产生所需表面的方法。分析着重于在不同照明模式下观察到的岩石学薄片。呈现了从特征样本显微照片产生的伪彩色图像,以便更好地说明相关特征。准备的灰泥层总是含有来自当地的砂砾,主要是未经冲洗的河沙,淤泥量增加。对于面漆-石膏灰泥层,骨料是通过将选定的浅色石材压碎而制成的;如果可以的话,可以使用大理石,但也可以找到其他石头。对于高质量的油漆,总是使用相同的原材料以减小的粒度施加许多intonaco层,并最终混合颜料。尽管这是产生光滑表面的常用方法,但发现了一些实例,这些实例表明在涂漆之前先将硬化的tonona磨成粉。涂料层的微观方面清楚地指出了将石灰颜料着色施加到干燥或半干燥的表面上,即未使用真正的壁画技术。

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