The consolidation of wall paintings is particularly challenging when high contents of water and hygroscopic salts have contaminated the masonry. Many wall paintings are in this situation, but only a few of them offer the possibility of easy access and long-term monitoring. The 14th century wall painting located on the east wall of the Chapter Hall of Chartres Cathedral (France) is one of these. The aim of this study was to assess the compatibility, efficacy and long-term behaviour of nanolime Calosil IP5, ethyl silicate Silres BS OH 100 and acrylic resin Primal E330S for the consolidation of such wall paintings. Observations and tests were performed before applications of products, then three, nine and fifteen months after. Temperature and relative humidity were monitored next to the tested areas during the whole period of the study.

Nanolime did not improve the superficial cohesion of paintings, and whitish spots of lime appearing after application remain even after cleaning with cellulose poultice. Ethyl silicate did not show any measurable consolidating effect, but fifteen months after application it kept its initial hydrophobicity. A significant consolidating effect was achieved with the acrylic resin without considerable changes of water absorption and repellency, despite the appearance of some rare and scarce white spots.

当高含量的水和吸湿性盐污染砌体时，壁画的固结特别具有挑战性。许多壁画都处于这种情况下，但是只有少数壁画提供了易于访问和长期监控的可能性。其中之一就是位于沙特尔大教堂（法国）章节厅东墙上的14世纪壁画。这项研究的目的是评估纳米石灰Calosil IP5，硅酸乙酯Silres BS OH 100和丙烯酸树脂Primal E330S的相容性，功效和长期性能，以巩固此类壁画。观察和测试是在产品应用之前进行的，然后在三个，九和十五个月后进行。在整个研究期间，温度和相对湿度在测试区域附近进行监控。

纳米石灰并不能改善绘画的表面粘合性，即使在用纤维素软膏清洗后，仍会留下白色的石灰斑点。硅酸乙酯没有显示任何可测量的固结效果，但是在施用后十五个月，它保持了其初始疏水性。尽管出现了一些稀有和稀少的白色斑点，但丙烯酸酯树脂仍具有显着的固结效果，而吸水率和拒水性没有明显变化。