This paper describes a cleaning method for removing ingrained carbonaceous dirt from lime-based wall paintings by utilizing hydrogels in combination with aqueous cleaning liquids. Nanorestore Gel® Peggy 6 has a number of advantages over traditional cleaning methods, and it is capable of holding large amounts of liquid, but it limits liquid penetration into the substrate. Cleaning action occurs only at the interface, without affecting the surrounding area or leaving residues. Furthermore, its viscosity makes it an ideal tool for treating irregular, vaulted surfaces. Laboratory experiments conducted on limewashed model tiles were decisive in the design of in situ experiments on fifteenth-century wall paintings. The cleaning efficiency of each method was assessed and quantified using colorimetry, 2-D FTIR mapping and image analysis using Cultural Heritage ImageJ. SEM-EDX was used for seeking residues. Results of both the model and in situ cleaning tests show a significant reduction of ingrained dirt when comparing Nanorestore Gel® Peggy 6 to traditional methods. Best visual results were obtained when cleaning with hydrogel loaded with 5% triammonium citrate was following by swabbing with a wet sponge. However, using water alone with the gel yielded almost as good a result in situ, making cleaning possible without any risk of residues.

本文介绍了一种清洁方法，该方法可通过将水凝胶与水性清洁液结合使用，从石灰基壁画中去除根深蒂固的碳质污垢。与传统的清洁方法相比，NanorestoreGel®Peggy 6具有许多优点，并且能够容纳大量液体，但是它限制了液体渗透到基材中。清洁动作仅发生在界面上，不会影响周围区域或留下残留物。此外，它的粘度使其成为处理不规则拱形表面的理想工具。在石灰水洗的模型砖上进行的室内实验对于现场设计至关重要15世纪壁画的实验。使用比色法，2-D FTIR映射和使用文化遗产ImageJ进行的图像分析来评估和量化每种方法的清洁效率。SEM-EDX用于寻找残留物。将NanorestoreGel®Peggy 6与传统方法进行比较时，模型和原位清洁测试的结果均显示出明显减少了根深蒂固的污垢。在用装有5％柠檬酸三铵的水凝胶清洁后，用湿海绵擦拭，可获得最佳的视觉效果。但是，单独使用水凝胶得到几乎一样好结果原位，使得没有残留任何风险清洗可能。