Effects of Different Mordants on Silk Fabric Dyed with Onion Outer Skin Extracts

Abstract

At present, a higher demand is put towards the use of natural dyes due to increased awareness of the environmental and health hazards associated with the synthesis and use of synthetic dyes. This research was conducted using onion outer skins as a potential source of natural plant dyes. In this study, extraction of dye was carried out in aqueous boiling method. Premordanting technique was followed using different mordants, namely alum, ferrous sulphate, tin, tannic acid, tartaric acid, and their combinations on silk fabric. Fabric samples dyed without using any mordant were then compared with the dyed samples pretreated with the mordants. The range of colors developed on dyed materials was evaluated by measuring the color values with respect toK/Svalues and color coordinates. It was concluded that the color values were found to be influenced by the addition of mordants, and thus different fashion hues were obtained from the same amount of dye extract using different mordants. Ferrous sulphate was found as the most influential mordant.ΔEcmcvalues between unmordanted (Reference dyed) and metallic mordanted fabric samples were found higher than those between unmordanted and nonmetallic mordanted fabric samples. The dyed samples were evaluated for color fastness to washing, light, drycleaning, rubbing, and perspiration. The color fastness properties were found to be satisfactory and improved in many cases. From the fastness results, it was obvious that these dyes can also be applied on silk fabric without using any mordant if required.

Utilization of Arum Manis Mango Leaves (Mangifera Indica Linn) as Textiles Natural Dyes

“…Konsentrasi yang tepat akan berpengaruh terhadap intensitas warna dan ketahanan luntur kain yang diberi pewarna alami. Semakin besar konsentrasi fiksator yang diberikan, ion yang terdapat pada fiksator akan mengalami peningkatan dan dapat mengikat zat warna dan serat semakin baik (Sasas et al, 2000;Uddin, 2014).…”

Study on the color levelness of silk fabric dyed with vegetable dyes

“…Most of these dyes require some sort of mordant to set permanently in the fibers. Metal ions of mordants which are widely used act as electron acceptors for electron donors to form coordination bonds with the dye molecules, making them insoluble in water [9,10]. This leads to improve dye uptake and retention, which result in a greater depth of shade and color fastness properties [11].…”

Efek Pemordanan terhadap Pewarnaan Menggunakan Kombinasi Limbah Cair Gambir dan Ekstrak Kayu Secang pada Kain Rayon dan Katun

“…Ekstrak pewarna kulit luar bawang merah dengan mordan ferrous sulfat dan aluminium sulfat, serta Chamaecyparis lawsoniana dengan penambahan mordan pada berbagai konsentrasi dapat meningkatkan nilai K/S (Kilinc et al, 2015;Uddin, 2014). Selanjutnya ditambahkan bahwa logam mordan membentuk ikatan koordinat dengan kelompok karboksil (-COOH) selulosa dan (-NH 2 ) serat protein.…”

“…Satu molekul pewarna dapat membentuk satu ikatan dengan satu molekul serat. Akan tetapi satu molekul mordan dapat membentuk dua atau lebih ikatan dengan molekul pewarna yang dapat menaikkan serapan terhadap zat warna (Ahmad et al, 2011;Uddin, 2014).…”

“…Secara umum mordan dapat meningkatkan ketahanan luntur warna kain yang diwarnai dengan limbah cair gambir dan kayu secang. Kemampuan logam mordan yang dapat membentuk dua atau lebih ikatan dengan molekul pewarna dapat meningkatkan nilai ketahanan luntur dari kain yang diwarnai (Uddin, 2014).…”