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

对大自然的色彩感兴趣的人正在增加。然而，天然染料有几个缺陷。它们的颜色变化范围不大。它们的色牢度还不够。本研究项目旨在开发天然染料的实际应用，取得了以下成果。(1)为了用新的染色方法增色，研究了用日本青黛鲜叶进行各种颜色的染色。明确了蓝宝石红色着色剂的产生条件，并对其进行了叶绿素的染色试验。(2)用明矾复染恢复了古代茜草和丁香花的色泽和牢度。(1)考察了洗涤剂各组分对洗涤剂耐洗涤性能的影响，揭示了固色剂对媒染金属离子的贡献。(2)为提高红花的耐光色牢度，考察了媒染剂对红花着色剂的影响。(3)通过成湖提高了各种天然染料的色牢度。为了增加天然染料在颜色之外的新特性，对其抗菌活性进行了检测。叶绿酸铜钠有此活性，但微胶囊包埋后，其活性消失。此外，市售的18种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.