Steger Simon, Stege Heike, Bretz Simone, Hahn Oliver
BAM Federal Institute for Materials Research and Testing, Division 4.5, Unter den Eichen 44-46, Berlin, Germany.
Doerner Institut, Bayerische Staatsgemäldesammlungen, Barer Str. 29, Munich, Germany.
Spectrochim Acta A Mol Biomol Spectrosc. 2018 Apr 15;195:103-112. doi: 10.1016/j.saa.2018.01.057. Epub 2018 Feb 3.
A non-invasive method has been carried out to show the capabilities and limitations of Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) for identifying of colourants and binders in modern reverse glass paintings. For this purpose, the reverse glass paintings "Zwei Frauen am Tisch" (1920-22), "Bäume" (1946) (both by Heinrich Campendonk), "Lofoten" (1933) (Edith Campendonk-van Leckwyck) and "Ohne Titel" (1954) (Marianne Uhlenhuth), were measured. In contrast to other techniques (e.g. panel and mural painting), the paint layers are applied in reverse succession. In multi-layered paint systems, the front paint layer may no longer be accessible. The work points out the different spectral appearance of a given substance (gypsum, basic lead white) in reverse glass paintings. However, inverted bands, band overlapping and derivative-shaped spectral features can be interpreted by comparing the spectra from the paintings with spectra from pure powders and pigment/linseed oil mock-ups. Moreover, the work focuses on this method's capabilities in identifying synthetic organic pigments (SOP). Reference spectra of three common SOP (PG7, PY1, PR83) were obtained from powders and historical colour charts. We identified PR83 and PY1 in two reverse glass paintings, using the measured reference spectra. The recorded DRIFTS spectra of pure linseed oil, gum Arabic, mastic, polyvinyl acetate resin and bees wax can be used to classify the binding media of the measured paintings.
已开展一种非侵入性方法，以展示漫反射红外傅里叶变换光谱法（DRIFTS）在识别现代反向玻璃画中的着色剂和粘合剂方面的能力及局限性。为此，对反向玻璃画《桌旁的两位女性》（1920 - 22年）、《树木》（1946年）（均为海因里希·坎彭东克所作）、《罗弗敦群岛》（1933年）（伊迪丝·坎彭东克 - 范·莱克维克所作）和《无题》（1954年）（玛丽安·乌伦胡特所作）进行了测量。与其他技术（如木板画和壁画）不同，这些画的颜料层是反向依次涂抹的。在多层颜料体系中，最前面的颜料层可能无法再触及。该研究指出了给定物质（石膏、碱式碳酸铅白）在反向玻璃画中的不同光谱表现。然而，通过将画作的光谱与纯粉末和颜料/亚麻籽油模型的光谱进行比较，可以解释反转谱带、谱带重叠和导数形状的光谱特征。此外，该研究聚焦于这种方法在识别合成有机颜料（SOP）方面的能力。从粉末和历史色卡中获得了三种常见SOP（PG7、PY1、PR83）的参考光谱。我们利用测量得到的参考光谱，在两幅反向玻璃画中识别出了PR83和PY1。所记录的纯亚麻籽油、阿拉伯树胶、乳香、聚醋酸乙烯酯树脂和蜂蜡的DRIFTS光谱，可用于对所测画作的粘结介质进行分类。
