Abstract
Bridelia ferruginea B dye was extracted from the bark of the tree using aqueous extraction method. Extracted dye was used to dye cellulosic (cotton) fabric in presence of 5% calcium chloride (CaCl2) or 5% alum (KAl(SO4)2·12H2O) of weight of fabric (o.w.f) as mordant. Fabric dyed without mordant was lighter in hue than metal ion mordanted dyed fabrics. The fabrics dyed in presence of calcium chloride as mordant are of deeper hue than those dyed with alum as mordant. Hence, their dye-uptake and color strength (K/S) are in the same order. K/S value of fabric dyed with alum is 43.71% higher than that without mordant and fabric dyed with calcium chloride has K/S value 51.09% higher than dyed with alum as mordant. CIEL*a*b* coordinate indicator and color space quadrant showed that those dyed fabrics without mordant and with alum as mordant are closer to yellow than red color. Those cellulosic fabrics dyed with calcium chloride as mordant are closer to red than yellow color as confirmed in colour space quadrant. Pre-mordanted dyed fabrics are of deeper color than post-mordanted dyed fabrics than meta-mordanted dyed fabrics than unmordant dyed fabric. Fastness properties of B. ferruginea B dyed cellulosic fabrics ranged from good (3) to excellent (5).
Highlights
Appealing of textile apparels to the consumers is strongly aided by the color(s) on them (Bhuiyan et al 2017; Opoku-Asare et al 2013)
Natural and synthetic dyes are types of dyes used in coloring textile materials (Khan et al 2012)
Dye extraction The yield of the extract of B. ferruginea B tree back was calculated from weight of ground material before and after extraction/purification operations (Table 1)
Summary
Appealing of textile apparels to the consumers is strongly aided by the color(s) on them (Bhuiyan et al 2017; Opoku-Asare et al 2013) These colors are obtainable from either dyes or pigments (Yusuf et al 2016). Natural dyes are first made to color textile materials, history dated back to ancient time of pre civilized day of Egyptians (Koren 1995). The applications of these dyes on textile apparels witness set back due to their limitations, such as lack of hue uniformity, low yield, poor adhesion and poor fastness properties (Micheal et al 2003).
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