Development of natural dye standard for Eri silk | การพัฒนามาตรฐานสีย้อมธรรมชาติของไหมอีรี่
2009
Somying Chuprayoon(Office of the Permanent Secretary for Agricultural and Cooperatives, Bangkok (Thailand)) | Sivilai Sirimungkarat(Khon Kaen University, Khon Kaen (Thailand). Faculty of Agriculture. Department of Agricultural and Resource. Program in Entomology) | Dusit Pojun(Department of Industrial Promotion, Bangkok (Thailand). Industrial Promotion Centre Region 5)
Objective of the development process of the natural dye standards for Eri silk was to establish a set of the basic standards. The testing process were carried out with 16 dye-giving plants, Tectona grandis L.f., Cassia siamea Britt., Terminalia catappa L., Diospyros mollis Griff., Morus alba Linn., Erythrina variegata L.,Tagetes erecta Linn., Clitoria ternatea Linn., Peltophorum dasyrachis (Miq.) Kurz., Plerocapus indicus Wild., Artocarpus heterophyllus Lamk., Azadirachta indica A., Garcinia vilersiana Rerr., Terminalia chebula Retg., Morinda coreia Ham, Thytocrene bracteata Wall., and an insect, Laccifer lacca Kerr. The dyeing technique for Eri silk natural dye is mhot dyen at 90-95 deg C for 25-30 min included both with and without mordant substances. The result of the above testing came 30 different colours on Eri silk yarn, 11 of which were further undergone durability test. The results were that 9 of 11 tested dyed samples showed light durability at levels 4-6 (good-excellent), washing durability at levels 4-5 (good-excellent), 10 of 11 samples showed their durability to fake sweat at both alkaline and acid states at levels 4-5 (good-excellent) and 7 of 11 samples showed brushing (dry) durability at level 4 (good). The results of the test indicated that it was possible to use natural dyes on Eri silk yarn and had durability standards at a good level provided that the right process was followed with at least 2 times dyeing. The use of mordant proved that the Eri silk yarn absorbed more dye stuff and gave brighter colour shades.
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