Aguilar-Rodríguez Pablo, Zetina Sandra, Mejía-González Adrián, Esturau-Escofet Nuria
Instituto de Química, Universidad Nacional Autónoma de México, México City 04510, México.
Instituto de Investigaciones Estéticas, Universidad Nacional Autónoma de México, México City 04510, México.
ACS Omega. 2025 Apr 18;10(16):16309-16318. doi: 10.1021/acsomega.4c10530. eCollection 2025 Apr 29.
, 1939, is Frida Kahlo's most renowned achievement. This work now presents conservation problems, especially around white regions. In 2008, ten microsamples of were studied by scanning electron microscopy with energy-dispersive X-ray spectroscopy. Recently, to understand its alterations, the microsamples were reanalyzed using nuclear magnetic resonance spectroscopy, micro-Fourier transform infrared spectroscopy, attenuated total reflection infrared spectroscopy, and electron microscopy. The analysis revealed a pictorial layer affected by metallic soaps and the presence of zinc lactate, which is typically associated with environmental contamination. A metal-catalyzed radical pathway is posited by this study. According to this hypothesis, the oxidative drying processes of linseed oil generate free radicals that degrade the cellulose of the cotton canvas. This hypothesis is based on the pictorial technique employed by Frida Kahlo, whereby the absence of a preparation base for her canvas is highlighted, which resulted in the transmission of the drying oil to the canvas fabric.
1939年创作的《》是弗里达·卡罗最著名的作品。这幅作品如今出现了保存问题，尤其是白色区域周围。2008年，通过能量色散X射线光谱扫描电子显微镜对十个《》的微量样本进行了研究。最近，为了解其变化情况，使用核磁共振光谱、微傅里叶变换红外光谱、衰减全反射红外光谱和电子显微镜对这些微量样本进行了重新分析。分析揭示了一个受金属皂影响的绘画层以及乳酸锌的存在，乳酸锌通常与环境污染有关。这项研究提出了一种金属催化自由基途径。根据这一假设，亚麻籽油的氧化干燥过程会产生自由基，这些自由基会降解棉帆布的纤维素。这一假设基于弗里达·卡罗所采用的绘画技巧，该技巧突出了她的画布没有打底这一点，这导致干性油渗透到画布织物中。
