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Black-dyed artefacts are found in museums worldwide, many produced using an iron-tannate compound. Deterioration of iron-tannate dyed artefacts is an international preservation issue: in New Zealand the deterioration of paru (iron-tannate) dyed Māori textiles is widespread. This article reports experimental work testing the efficacy of sodium alginate, a consolidant developed for deteriorated paru-dyed muka (fibre from harakeke; Phormium tenax). The colour stability, strength retention, and acidity of paru-dyed muka consolidated with sodium alginate (0.25, 0.5, and 1% w/v in water) was tested pre- and post-artificial light ageing. This study found that sodium alginate had no negative effect on paru-dyed muka and in some cases provided benefit. Interestingly, the colour of paru-dyed muka is substantially more stable in UV-filtered light than previously recognised. Also microfading results were in agreement with visual assessments of colour change at 1 Mlux hour exposure, providing confidence in this relatively new technique to assess colour change. 相似文献
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采用热水法和碱法提取鹿角海萝多糖,并研究其部分理化性质.实验结果表明,热水提取法多糖得率明显高于碱提法,鹿角海萝中的总糖质量分数为40％;热水法提取的多糖中3,6-内醚半乳糖含量明显低于碱提法,而D-半乳糖的含量明显高于碱提法;由于多糖的硫酸基含量较少,鹿角海萝多糖可能不是卡拉胶而是琼胶类. 相似文献
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