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이상필(Lee Sang-Phil) 한복문화학회 2004 韓服文化 Vol.7 No.1
Natural dyeing means coloring with dyes extracted from plants, minerals or animals found in nature. Natural ( provides calm and natural colors; it has antibacterial and deodorizing Qualities; and the dyeing process is environm friendly. This study extracted natural dyes from young fruit by thinning out the superfluous fruits of Naju pear trees, ar examined its dyeing properties and its color fastness for practical use. The results indicated that dye uptake was go silk, cotton and rayon, but not for nylon and polyester. In redyeing them, their dye uptake was more highly effective al color fastness was also good.<br/>
이상필 ( Sang Phil Lee ),김순희 ( Soon Hee Kim ) 복식문화학회 2011 服飾文化硏究 Vol.19 No.3
The process of making or cultivating indigo dyes is very cumbersome and complex. The dye extraction and dyeing methods using general plant dye, moth repellent dye, fast acting natural dye, and other dyes are very different. This research investigates the extraction of indigo dye and liquid dye extraction of polygonum(indigo) plants using calcium oxide water. While extracting indigo dye the concentration of purified indigo dye may be controlled by adjusting the pH level. Due to the various uses of dyes the adjustment of surface color must be considered. In regard to the change according to different concentrations of reducing agents, it was found that cotton fabrics and ramie fabrics show the highest color difference at 0.4% and 0.3% respectively. As the reduction temperature increases, the color difference increases as well. The maximum color difference was found to appear at 90t. Cotton fabrics and ramie fabrics showed 70.55 and 67.01 respectively. The color difference increases as the concentration of dyes increases, but at a concentration of 300%, cotton fabrics was found to show 6.22PB in H value using the Munsell color system, containing purple and blue color. The pH of the polygonum dyes extracted through this experiment were adjusted by adding calcium oxide to the experimental water without directly adding calcium oxide to the liquid polygonum extract. In a refine state, it was mixed with polygonum extract to extract a more refine and highly concentrated indigo dye. When lye and reducing agents are added to extracted indigo dye and sealed for long-term storage, it can be effective and easily used for dyeing.