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Stabilization Methods for Black-Dyed Silk Used for Seals Attachment
Restaurator ( IF 0.333 ) Pub Date : 2021-06-01 , DOI: 10.1515/res-2020-0018
Markéta Škrdlantová 1 , Klára Drábková 2 , Dominika Nagyová 2 , Jan Krejčí 2 , Hana Paulusová 3 , Michal Ďurovič 2 , Šárka Msallamová 1
Affiliation  

Textile cords and ribbons are an integral part of archival documents with pendent seals. These textiles are frequently highly degraded, especially in case of black-dyed silk. However, their maintenance in good condition is necessary for retention of the seal and thus the legal value of the document. Methods of chemical stabilization of iron-gall inks on a paper support are promising also for stabilization of degraded black-dyed silk. This chemical stabilization is based on deacidification or the use of antioxidants or a combination thereof. The deacidification is potentially dangerous for silk because of its high stability in the slightly acidic region. Therefore the stability of silk in the alkaline pH region was measured and even long-term immersion of silk in a medium with pH 9 did not result in degradation changes. The selected reagents (methoxymagnesium methyl carbonate, tetrabutylammonium bromide, cysteine, calcium phytate and tannin) were tested. The effect of stabilization procedures was studied on artificially damaged samples of black-dyed silk containing unbound ferrous ions. The effectiveness of the stabilization procedures and their influence on the long-term stability of silk were evaluated by means of colorimetry, mechanical properties (flexural rigidity, thread tensile strength), measuring the pH of the silk surface and scanning electron microscopy.

中文翻译:

印章附件用黑丝的稳定方法

纺织线和丝带是带有悬垂密封的档案文件的组成部分。这些纺织品经常被高度降解,特别是在黑色丝绸的情况下。然而,它们保持良好状态对于保留印章以及文件的法律价值是必要的。在纸载体上化学稳定铁胆油墨的方法也有望稳定降解的黑色染色丝绸。这种化学稳定是基于脱酸或使用抗氧化剂或其组合。脱酸对丝绸有潜在危险,因为它在弱酸性区域具有高稳定性。因此,测量了蚕丝在碱性 pH 范围内的稳定性,即使将蚕丝长期浸泡在 pH 值为 9 的介质中也不会导致降解变化。对选定的试剂(甲氧基甲基碳酸镁、四丁基溴化铵、半胱氨酸、植酸钙和单宁)进行了测试。研究了稳定程序对含有未结合亚铁离子的人为损坏的黑色染色丝绸样品的影响。通过比色法、机械性能(弯曲刚度、线抗张强度)、测量丝表面的 pH 值和扫描电子显微镜来评估稳定程序的有效性及其对丝长期稳定性的影响。
更新日期:2021-06-17
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