Physicochemical Studies and Application of Some Natural Extracts and Its Metallic Mordant Complexes as Dyes for Textile Fabrics

Abstract

The aim of this present study is to evaluate the performance and efficiency of dyeing of cotton, wool and polyamide from dry skin Allium cepa and henna fabrics with natural dyes obtained as extracts leaves.In recent years, an upsurge of interest in natural dyes has been manifested as replacement of synthetic dyes for food and drugs' safety and so forth. Natural dyes have limitations of fastness, and brilliancy of shade. Therefore, in present work, use of metallic mordant was investigated to produce depth of shade, bright and fast colors. Natural dyes may chemically be classified as vat, direct, acid and\or pigment. Accordingly, efficiency and performance of dyeing were assessed on different natural and synthetic fibers. However, some good fast colors were obtained.The preference of using easily, and cheaply, without any chemical processing, results in availability of materials for dyeing by conventional dyeing which lowers the cost of natural dyeing; this enhances resource productivity, and as a result, reduces solid wastes. This makes onion scale and henna leaves one of the easily available raw materials for natural dyeing industry. However, part (II) of present work compiles preparation , physico-chemical assessment, and application of some metallic mordent's (Cr +3 ,Co +2 ,Ni +2,Cu +2 ) of present natural dyes ,in a trial to obtain more chromaticity ,affinity and better fastness of colour.

An Overview of Natural Dyes Extraction Techniques for Valuable Utilization on Textile Fabrics

“…[4,53] Most farmed onions have around 89 % water, 4 % sugar, 1 % protein, and 2 % fibre. [43,54] Onions include as well as substances such as phenolic and flavonoids and minerals such as iron, calcium, manganese, and zinc. [30,36] and Fig.…”

“…Aqueous extraction of processed onions skin with distilled water was performed, and the extract was heated before being filtered and allowed to cool. [54] The onion peel waste was provided from a nearby market. The onion's outer layer was peeled from the bulb and thoroughly washed with distilled water.…”

“…The crude extracts were recrystallized using carbon tetrachloride as a solvent and then airdried to yield pure dye samples. [31,54,57,58]…”