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首页> 外文会议>LACONA (Conference) >Poultices as a Way to Eliminate the Yellowing Effect Linked to Limestone Laser Cleaning
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Poultices as a Way to Eliminate the Yellowing Effect Linked to Limestone Laser Cleaning

机译：Poultices作为消除与石灰石激光清洁有关的黄化效果的一种方式

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One of the main drawbacks raised against stone cleaning by Nd:YAG Q-switched lasers (1,064 nm, 6–20 ns) is the yellow aspect left after cleaning. It is well known among stone conservators that one may attenuate this colour using waterbased poultices.We tested four kinds of poultices in two areas on the northern portal of the Saint Denis cathedral, which had been laser cleaned in 1997. The yellow aspect visibly decreased immediately after poultice removal, and the effect remained visible after 12 months. Colour measurements performed before, just after, 3 and 9 months after poulticing confirmed and quantified observations. Scotch tape tests, optical microscope and SEM-EDS observations and analyses show that this reduction is due at least partly to poultice remnants when poultice contains attapulgite or carboxymethyl- cellulose. Fume silica poulticing also seems to leave relics on the treated surface. The use of cellulose alone leads to a slight de-yellowing without any poultice relics being present. In that case, the de-yellowing could be due to solubilization of yellow products or physical detachment of particles.
机译：通过ND的石材清洁提出的主要缺点之一：YAG Q开关激光器（1,064nm，6-20ns）是清洁后留下的黄色方面。它是众所周知的石油保护者，其中一个人可以使用Waterbased Poultices衰减这种颜色。我们在1997年的Saint Denis大教堂的北部门户网站上测试了四种碎片。在1997年被激光清洁。黄色方面立即下降在泡沫去除后，12个月后，效果保持可见。在Poulticing确认和量化的观察中，在Poulticing后，3和9个月之前进行的颜色测量。透析胶带测试，光学显微镜和SEM EDS观察和分析表明，当猪肉含有凹凸根或羧甲基 - 纤维素时，这种减少至少部分到Poultice残余物。烟雾硅片似乎也留下了处理过的表面上的遗物。单独使用纤维素导致轻微的脱黄，而没有任何毒品遗物存在。在这种情况下，脱黄可能是由于黄色产品的溶解或颗粒物理脱离。

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