Development of new natural dyes for wool and silk fabrics.

In order to develop new natural dyes and enrich the hue of natural dyes, onion, morning glory, purple cabbage, grape skin, black rice and other new natural dyes were selected to dye on silk and wool fabrics. After dyeing, the color fastness was evaluated. The results showed that the dyes from onion skins had a strong affinity for protein fibers. The dyes from grape skin, morning glory, black rice and purple cabbage had a poorer affinity for protein fibers than onion. The mordant can improve the depth of color. In the experiment, wool and silk fabrics were dyed into blue tone by the purple cabbage dye, green tone by the purple onion and morning glory dyes; purple gray tone by the dyes from black rice and the grape skin. Be testing, the dry rubbing fastness of all fabrics was better; however, the grade of wet rubbing fastness was lower than that of dry rubbing fastness. The level of color fastness to sunlight of the onion skin dyes was higher. [ABSTRACT FROM AUTHOR]