Although the main prehistoric color used for paintings is red, knowledge of this coloring matter often boils down to saying that it is “ochre.” However, the red coloring matter of Prehistory is numerous and may have been the subject of various preparations, mixtures, or even alterations. Understanding the use and transformation of coloring matter raises questions about the technical processes but also about the supply strategies of these ancient societies. In the case of analysis of solid archaeological remains, we can access the petrography, mineralogy and chemistry of these ferruginous rocks. But, when it is about deposited powder, the means of investigation become limited. We therefore propose to test the complementarity of spectro‐radiometry, a non‐invasive method that allows us to obtain a spectral signature of the material whatever its mode of preparation. From six geological reference samples chosen for their color (from red to yellow) and for their mineralogical composition, spectra in the visible and near‐infrared were recorded under several experimental conditions and several modes of preparation of the matter, using two spectro‐gonio radiometers. It is then possible to discriminate these different coloring matter on the basis of their spectral signature and to understand the link with their mineral composition.

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如何区分史前时期使用的红色物质？可见光近红外漫反射光谱学的贡献

尽管用于绘画的史前主要颜色是红色，但对这种着色材料的了解通常可以归结为说它是“ re色”。但是，史前时期的红色物质很多，可能已经成为各种准备工作，混合物甚至变化的主题。理解色素的使用和转化提出了有关技术过程的问题，也提出了有关这些古代社会的供应战略的问题。在分析固体考古遗迹的情况下，我们可以访问这些铁质岩石的岩石学，矿物学和化学性质。但是，当涉及沉积粉末时，研究手段变得有限。因此，我们建议测试光谱辐射仪的互补性，一种非侵入性方法，无论我们采用何种制备方式，都可以使我们获得该材料的光谱特征。从颜色，颜色（从红色到黄色）及其矿物组成选择的六个地质参考样品中，使用两个分光测角仪在几种实验条件和几种制备方式下记录了可见光和近红外光谱。然后可以根据它们的光谱特征来区分这些不同的色素，并了解与它们的矿物成分的联系。使用两个分光辐射计，在几种实验条件和几种物质制备方式下，记录了可见光和近红外光谱。然后可以根据它们的光谱特征来区分这些不同的色素，并了解与它们的矿物成分的联系。使用两个分光辐射计，在几种实验条件和几种物质制备方式下，记录了可见光和近红外光谱。然后可以根据它们的光谱特征来区分这些不同的色素，并了解与它们的矿物成分的联系。