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A study of surface optical properties for characterizing the cleaning process of paintings

机译：用于表征绘画清洁过程的表面光学特性的研究

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"Cleaning" is a process of carefully identifying the cause of any deterioration or discolouration and then removing or treating these layers. The skill of the restorer is not only to understand the techniques and media used by the artist, but also to recognize what beauty lies beneath the veils of many years of neglect or adverse conditions. Surface cleaning is then one of the most important and sometimes controversial stages of the conservation process: it is an irreversible process that generally results in substantial physical changes of the object surface, raising thus a series of questions regarding aesthetics, the potential loss of historical information, and the ability to control the cleaning process adequately. Decisions have to be made regarding partial or complete removal of varnish: technical considerations include selection of a method that allows a great deal of control in the cleaning process, so that undesired layers can be removed without damaging the underlying ones by means of traditional cleaning methods, including mechanical or chemical removal. In this work we present a study of the optical properties of painting surfaces for the characterization of the cleaning process. Analyses were carried out by means of laser micro-profilometry and confocal microscopy. Measurements were carried out on a few paintings which are under repair at the Opificio delle Pietre Dure in Florence. Selected areas were surveyed with the two above mentioned techniques and results were correlated.
机译：“清洁”是仔细确定任何变质或变色的原因，然后去除或处理这些层的过程。恢复者的技能不仅是了解艺术家所使用的技术和媒体，而且还是要认识到多年的忽视或不利条件掩盖下的美是什么。因此，表面清洁是保护过程中最重要的，有时甚至是有争议的阶段之一：这是一个不可逆的过程，通常会导致物体表面发生实质性的物理变化，从而引发一系列有关美学，历史信息潜在损失的问题以及充分控制清洁过程的能力。必须就部分或完全清除清漆做出决定：技术考虑因素包括选择一种可以在清洗过程中进行大量控制的方法，以便可以通过传统清洗方法去除不需要的层而不会损坏底层，包括机械或化学去除。在这项工作中，我们对涂漆表面的光学特性进行了研究，以表征清洁过程。通过激光显微轮廓仪和共聚焦显微镜进行分析。在佛罗伦萨的Opificio delle Pietre Dure维修中的几幅画上进行了测量。使用上述两种技术对选定的区域进行了调查，并将结果关联起来。

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