The Color Fastness and Quality of Eco-Printed Leather with Different Types of Mordant in Natural Dyes from Mangrove Extract (Rhizophora mucronata)

Abstract

This study evaluated the color fastness and crust quality of eco-printed leather using various types of mordant in the natural dye of mangrove extract. This study used 20 sheepskin crusts and mangrove bark extract. This experimental study employed a Completely Randomized Design (CRD) with different mordant types as the treatments. The types of mordant used were Aluminum Sulfate (Al 2 (SO 4 ) 3 ), Calcium Carbonate (CaCO 3 ), Citric Acid (C 6 H 8 O 7 ), and Ferrous Sulfate (FeSO 4 ). The results showed that the use of Ferrous Sulfate (FeSO 4 ) as a mordant gave a darker color and produced better color fastness on eco-printed leather to dry and wet rubbing with a value of 5 (very good), to washing with a value of 4-5 (good), and to sweat with a value of 5 (very good). The use of Ferrous Sulfate (FeSO 4 ) as a mordant improved the tensile strength (p= 0.078), decreased the elongation (p= 0.008), increased the elasticity (p= 0.000), and increased the cracking resistance (p= 0.013) of the ecoprinted leather as well as produced more stable stitch-tear strength of the eco-printed leather. It is concluded that using Ferrous Sulfate (FeSO 4 ) as a mordant gives a brownish yellow color, increases color fastness to wet rubbing, dry rubbing, washing, sweating, improves crust qualities especially tensile strength and cracking resistance, and decreases the elongation of eco-printed leather.

Bio-mordants: a review

“…At the end of dyeing, it was stated that cotton samples colored in red tones could be obtained with citric acid (Oancea et al 2021 ). Pancapalaga et al ( 2022 ) used 20 sheepskin crusts and mangrove bark extracts in their study to evaluate the color fastness and bark quality of eco-printed leather by using various types of mordants in the natural dye of mangrove extract. The study was done in a completely random design (CRD) using materials such as aluminum sulfate, calcium carbonate, citric acid, and iron sulfate as mordants.…”

Colorant extraction from turmeric (Curcuma Longa L) and optimization of its application on chrome-free tanned paiche (Arapaima gigas) leather

“…In the mordanting process involving alum (hydrated double sulfate salt of aluminum), which undergoes complete hydrolysis, Al+3 ions replace hydrogen atoms within the carboxyl groups of curcumin, forming coordination complexes with the carboxyl groups of collagen. This enhances the fixation of curcumin onto leather [21,33,34]. The present study aimed to employ curcumin as a colorant in the dyeing process of paiche skins tanned with phenolic syntans and glutaraldehyde, thereby showcasing its technical feasibility for scaling up both in artisanal and industrial settings.…”