New Development of natural dyes - regeneration of color from nature -

对大自然色彩感兴趣的人越来越多。然而，天然染料有几个缺陷。它们的颜色变化范围不大。它们的色牢度不够。本研究项目旨在开发天然染料的实际用途，结果如下：(1)为了用新的染色方法增加染料的颜色，研究了用日本靛蓝植物鲜叶进行各种颜色染色的方法。阐明了红色着色剂靛玉红的生产条件，并对叶绿素的染色进行了考察。(2)明矾复染恢复了古麻染和格伦威尔染色的颜色和牢度。(1)通过对洗涤剂组分对槲皮素洗涤色牢度影响的研究，揭示了隔离剂对媒染剂金属离子的贡献。(2)为提高红花的耐光色牢度，研究了媒染剂对红花着色剂的影响。(3)通过形成色湖的方法，提高了各种天然染料的色牢度。为增加天然染料除颜色外的新特性，对其抑菌活性进行了研究。叶绿素铜钠具有活性，但加入微胶囊后活性消失。此外，18种市售植物染料中有几种具有这种活性。

People who are interested in color from nature are increasing. However natural dyes have several defects. They do not have a wide range of color variation. Their colorfastness is not enough. The following results are obtained from this research project aiming to develop the practical use of natural dyes.1. (1) To increase the colors by new method of dyeing, various color dyeing using fresh leaves of Japanese indigo plant was investigated. Conditions to produce a red colorant, indirubin were clarified and the dyeing of chlorophyll was examined. (2) The colors and the fastnesses of ancient madder and Gromwell dyeing were restored with Alum duplicate mordanting.2. (1) The investigation of the effect of detergent components on the colorfastness of laundering to quercetin revealed the contribution sequestering agent to mordant metal ions. (2) To improve color fastness to light, effect of mordant to the colorant of safflower was examined. (3) Improvement of color fastness of various natural dyes by forming lakes was achieved.3. To add new characteristic of natural dyes besides color, antibacterial activity was examined. Sodium copper chlorophyllin was found to have the activity but it disappeared when incorporated in microcapsule. In addition several of 18 commercially available vegetable dyes have the activity.