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Qualitative Analysis of Trace Amounts of Paint Pigments

AppNote B-XRD1005: qualitative analysis of pigments used in Japanese painting

Background

Japanese paintings consist of pigments and dyes laid down on substrates such as Japanese paper and silk. Deterioration of substrates and the fading and discoloration of pigments occur over time. For renovation and preservation of cultural properties, it is important to understand the deterioration of paintings scientifically. In this report, qualitative analyses of five small pieces (named “Uchi-gi”, “Matsu”, “Nami”, “Kimono”, and “Hakama”) of deteriorated Japanese paintings were performed to identify the pigments remaining on the substrate.  

Crystal phases can be identified by comparing the diffraction angle and absolute intensity of the obtained diffraction pattern with the large number of patterns included in the databases (qualitative analysis). With X-ray diffraction method, it is also possible to distinguish compounds which have the same chemical formula but different crystal packing (polymorphism) thanks to different diffraction patterns.

リガクのX線回折装置(XRD)

全自動多目的X線回折装置 SmartLab

装置が最適条件を教えてくれるガイダンス機能を実現。

全自動多目的X線回折装置 SmartLab SE

リガクの分析ノウハウを凝縮した「ガイダンス」機能を搭載。

デスクトップX線回折装置 MiniFlex

卓上タイプの高性能多目的粉末回折分析装置。

試料水平型多目的X線回折装置 Ultima IV

あらゆる用途のための高性能、多目的XRDシステム。