迅速・簡便な染色方法に用いた湖底土の特徴

概要

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The deep purple color of dyed silk derives from lake sediments in Shibayama-gata lagoon, Kaga City, Ishikawa, Japan. Quick and easy dyeing method in purple was found by using blackish gray fine clayey sediments in the lagoon, associated with hot spring water. The sediments consist of low crystalline chlorite, smectite, and kaolin minerals as well as a large amount of Fe associated with K, Ca, Ti, and Mn elements. The lake sediments occurred under reducing conditions, such as Eh-150mV and Dissolved Oxygen O.31mg/l, pH 6.7, and EC 1.12mS/cm. In the initial process, hot spring water (70℃) and tealeaves were used before preservation in the sediments. In this stage, the silk was not dyed yet, and was stained on only light in green color. The hot spring water with high salinity was collected from Katayamazu Hot Springs in Kaga, beside Shibayama-gata lagoon. The next process, the wet silk was dyed in deep purple with the lake sediments for few minutes, and was soaked in longer time the color get deepen. Anaerobic iron bacteria contribute to reducing Fe condition and dyeing in purple.
2004-12-16