首页> 外文期刊>Studies in conservation >Degradation of Emerald green in oil paint and its contribution to the rapid change in colour of the Descente des vaches (1834-1835) painted by Theodore Rousseau
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Degradation of Emerald green in oil paint and its contribution to the rapid change in colour of the Descente des vaches (1834-1835) painted by Theodore Rousseau

机译:狄奥多·卢梭(Theodore Rousseau)绘画的翡翠绿在油画颜料中的降解及其对快速改变的Descente des vaches(1834-1835)颜色的贡献

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摘要

Descente des vaches (1836) by Theodore Rousseau in the Mesdag Collection in The Hague is barely readable and its paint layers are in poor condition. The surface of the painting is strongly deformed and cracked, the whole painting has darkened and especially the greens have lost all or most of their colour resulting in brown passages. Large passages of the painting that were painted with multiple thick and medium-rich layers have darkened dramatically. This paper proposes that the degradation of Emerald green (Cu(C_2H_3O_2)_2-3Cu(AsO_2)_2, copperacetoarsenite) - the main green pigment used in this painting -is a significant factor in the cause of the darkening. Electron backscatter images reveal that the Emerald green particles are shown different degrees of degradation: from partially to completely disintegrated. Elemental maps show that arsenic is distributed throughout the paint cross section, with relatively higher concentrations around iron- and aluminium-containing particles, and in the varnish layer. Imaging-Fourier-transform infrared microscopy detects copper soaps in the degraded Emerald green-containing layers. Analytical data from four paint cross sections strongly suggest that Emerald green reacts with free fatty acids derived from the binding medium forming copper soaps and mobile arsenic-based species. Chemical laboratory experiments fully support this hypothesis. Emerald green and palmitic acid in chloroform form copper palmitate and arsenic trioxide (arsenolite, cubic) under room temperature and normal light conditions. The degradation of Emerald green particles in Descente des vaches has resulted in a loss of light-reflecting surfaces and in newly formed compounds in the paint, both contribute to the colour change from green to brown.
机译:海牙Mesdag藏品中的Theodore Rousseau的Descente des vaches(1836年)几乎不可读,其油漆层状况不佳。绘画的表面强烈变形和破裂,整个绘画变暗,尤其是绿色已经失去了全部或大部分颜色,从而形成棕色通道。涂有多个厚和中等丰富层的绘画的大段落已急剧变暗。本文提出,该涂料中使用的主要绿色颜料-翡翠绿(Cu(C_2H_3O_2)_2-3Cu(AsO_2)_2,铜碳砷铁矿)的降解是导致变黑的重要因素。电子反向散射图像显示,翡翠绿色颗粒显示出不同程度的降解:从部分分解到完全分解。元素图表明,砷分布在整个涂料横截面上,其中铁和铝的颗粒周围以及清漆层中的砷含量相对较高。傅里叶变换成像红外显微镜可检测到降解的翡翠绿色层中的铜皂。来自四个油漆横截面的分析数据强烈表明,翡翠绿与衍生自结合介质的游离脂肪酸发生反应,形成铜皂和可移动的砷基物质。化学实验室实验完全支持这一假设。在室温和正常光照条件下,氯仿中的翠绿色和棕榈酸形成棕榈酸铜和三氧化二砷(亚砷酸盐,立方)。翡翠中的翡翠绿色颗粒的降解导致光反射表面的损失以及油漆中新形成的化合物的损失,这两者都导致颜色从绿色变为棕色。

著录项

  • 来源
    《Studies in conservation》 |2013年第3期|199-210|共12页
  • 作者单位

    Van 't Hoff Institute for Molecular Science, University of Amsterdam, PO Box 94157, 1090 GD Amsterdam, The Netherlands, The National Service for Cultural Heritage (RCE), Amersfoort, The Netherlands;

    FOM Institute for Atomic and Molecular Physics, Amsterdam, The Netherlands, JAAP Enterprise for Art Scientific Studies, Amsterdam, The Netherlands;

    Van Gogh Museum, Amsterdam, The Netherlands;

    The National Service for Cultural Heritage (RCE), Amersfoort, The Netherlands, Japan Center for International Cooperation in Conservation, National Research Institute for Cultural Properties, Tokyo, Japan;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Emerald green; Copper soap; Migration; Painting; Darkening; Arsenic; Arsenic trioxide; Scheele's green;

    机译:翡翠绿;铜皂;移民;绘画;变暗砷;三氧化二砷;舍勒的绿色;
  • 入库时间 2022-08-17 23:57:40

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