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Ancient Painting Restoration by Confocal Raman Microscope
Chinese traditional painting pigments have a history of more than 7000 years, mineral pigments because of their colorful, clean, durable characteristics, in China's ancient paintings are widely used. As a natural stone pigment that is not easily discolored, mineral pigments are more and more widely used in painting pigments.
Under the condition of external environmental factors and the change of internal painting material, the long-term preservation of ancient paintings is difficult, and it is often necessary to repair them regularly. As the main carrier of ancient painting pigments, in the restoration of ancient paintings generally need to be in advance of pigment composition, characteristics, etc. to identify, to develop a targeted repair plan to ensure the smooth repair work.
Using Raman spectral quantitative analysis method, the proportion and area ratio of stone-green mineral pigments in various inorganic pigment samples were measured, and the ratio of inorganic pigment composition in a painting was obtained. In all mineral pigments, stone green is used very commonly through the interpretation of ancient painting pigments, and focus on the optimization of the two isomers of stone green, explore its stable structure uv absorption and other properties, and further analyze the attribution of different spectral bands.Using the special algorithm of the software, the ultraviolet visible absorption spectrum of two types of stone-green molecules is obtained.As shown in the figure.
The coexistence problem in the pigments that may exist between the two companion minerals is distinguished by the identification of Raman feature spectrum. This paper analyzes the mineral minerals of lapis lazyan and the mineral pigments of the end of lapis lazyan given by Dunhuang Research Institute, and the application and source of lapis lazed pigments are identified by analyzing the differences in the spectral properties of Raman spectral 1100cm-1 or more between natural minerals, mineral pigments and synthetic pigments.This article provides data support for the rapid determination of the characteristics of stone-green pigments under the influence of sunlight, and can promote the improvement of pigment quality and contribute to the better protection of ancient cultural relics.
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