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Study on the discoloration of pigments induced by laser irradiation

机译：激光照射诱导颜料变色的研究

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Laser irradiation may alter the color of certain pigments used in artworks. Owing to the increasing use of lasers in artwork conservation this problem becomes extremely crucial especially in the case of a polychromy covered by environmental encrustation. X-ray diffraction analysis and optical microscopy were used to study the crystalline structure of selected irradiated pigments in order to identify the changes that take place upon laser irradiation. Two representative pigments were studied, cinnabar (HgS) and lead white (Pb(OH){sub}2 × 2PbCO{sub}3). The results revealed a change in the crystalline phase or chemical composition, respectively, which can be barely detected owing to its superficial character, which is of a sub-micrometer scale.
机译：激光照射可以改变艺术品中使用的某些颜料的颜色。由于在艺术品保护中越来越多地使用激光器，这一问题变得非常至关重要，特别是在环境结束所涵盖的多圆形的情况下。 X射线衍射分析和光学显微镜用于研究所选择的照射颜料的结晶结构，以识别激光照射时发生的变化。研究了两种代表性颜料，Cinnnabar（HGS）和铅白色（PB（OH）{Sub} 2×2×2pbco {sub} 3）。结果表明，晶体相或化学组成的变化分别是由于其具有亚微米尺度的浅表特性而几乎不能检测到的。

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