ENVIRONMENTAL SCIENCE ARCHIVES (original) (raw)
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Colorimetric Analysis and Fastness Rating of Natural Yellow Color Dyes on Cotton Fabric
Journal of Natural Science and Textile Technology, 2022
Today's environmental concern about the harmful effects of synthetic dyestuffs has arisen in our discourse on the use of natural dyes. Plant dyes are more favorable due to their non-toxicity, non-carcinogenic, non-allergic, and biodegradability over synthetic dyes to human beings. This work is intended to investigate the effects of three different natural yellow shaded dyes on the 100% cotton knit fabric using four kinds of synthetic mordant. A series of experiments were conducted to analyze and compare the results of these three sources of natural yellow dyes. Simultaneous extraction and dyeing methods were found to yield the best hues of yellow dye, as decided by colorimetric tests and visual analysis. The final samples were tested for fastness to light, wash, rubbing and perspiration by following the ISO standards. A significant change was observed in fastness properties and colorimetric analysis on copper sulphate treated turmeric dyed sample.
Investigation of the Colorfastness Properties of Natural Dyes on Cotton Fabrics
2020
The aim of this research was to identify the color fastness properties of the natural dyes on cotton fabrics using different types of dyes like mehedy/henna, turmeric, tea leaf and pomegranate, which were cheap, easily obtainable and ecofriendly. The findings established that, mehedy/henna dye reacted with cellulose of cotton in alkaline condition to form a permanent covalent bond between the dye and the cellulose, which would not be removed by frequent washing treatment with steaming water in neutral conditions and exposed excellent color fastness properties. Mehedy dye had a reactive group that acted as an integral part of fiber and this covalent bond was formed between the dye molecules and the terminal reactive group. With necessary treatments these dyes were collected from nature in powder form and liquefied them for dyeing on 100% cotton mercerized fabrics with necessary chemicals and auxiliaries as natural dyes had affinity towards cellulosic fibers. Continuous dyeing process...
Colour and fastness of natural dyes: revival of traditional dyeing techniques
Coloration Technology, 2010
Cotton and wool fabrics were dyed with nine natural dyes obtained by aqueous extraction of the original plants ⁄ insect in an attempt to reconstruct traditional textile dyeing recipes, to optimise the methodology at all stages, i.e. extraction, mordanting and dyeing, and to standardise it. Cochineal, madder, alkanna, henna, brazilwood, red sandalwood, safflower, indigo and logwood were used for the dyeings, which were carried out directly and after mordanting of the textile material. A variety of mordants, namely, aluminium potassium sulphate, potassium dichromate, copper sulphate, zinc chloride, iron(III) chloride, iron(II) sulphate and tin chloride, is anticipated to meet both early and recent requirements and options. The dyeings were evaluated through colour measurements and standard wash, light and rub fastness tests. Generally, the mordanting process known for many centuries and connected with the textile dyeing resulted in an improvement in dye absorption and fastness properties mainly for the cotton samples, as is concluded from the tests and measurement assessments.
Extraction of natural dyes for the coloration of Textile substrate is one the most important research area to the researchers. It is tried to extract the natural dyes from marigold flower through using the different kinds of mordanting agents. In this research, a particular source is used for dyes extraction. Before the extraction Patel of the marigold flower was extracted and dried on sunlight, subsequently dried in room temperature due to preserve the natural colorant. The natural dyes were extracted by boiling the above substrates in water without any chemicals. As mordant, Potash Alum [K 2 Al 2 (SO 4) 3 .24H 2 O], Ferrous Sulphate(FeSO 4),Copper Sulphate (CuSO 4),Nickel (II) Sulphate (NiSO 4),Potassium Dichromate (K 2 Cr 2 O 7),Stannous Chloride(SnCl 2) were used. The mordanting procedures were followed same for all the experiments. The treatment runtime was 60 minute at 100 o C. After mordanting each sample fabric was kept for 24 hours for conditioning and then the dyeing was done. But as there is no particular dyeing method for natural dyeing so it is followed some trial and some convenient methods were made after trial for several times. Mordanted samples were wet out in cold water before dyeing. During dyeing some salt or soda was added to observe the effects through the Runtime 60 minutes at 60 o C. After dyeing samples were cold rinsed and soaping was done and dried with hot air dryer. Finally the color fastness like Color fastness to wash, Color fastness to perspiration/saliva, Color fastness to water, Color fastness to rubbing and Color fastness to light were checked and found satisfactory result.
IMPROVING THE COLOUR FASTNESS OF THE SELECTED NATURAL DYES ON COTTON
This paper reports the improving the colourfastness of the natural dye with dye leveling agents, extraction of the colourants from natural sources; effects of different mordants and mordanting methods; selection of leveling agents; dyeing variables; development of newer shades with simultaneous treatment and analysis of colour improvement parameters with leveling agents for cotton dyed with natural dye; assessed colour improvement with colourfastness test.
Attaining Optimum Values of Colourfastness Properties of Sustainable Dyes on Cotton Fabrics
Fibres and Textiles in Eastern Europe
The aim of this research was to identify optimum values of the colorfastness properties of sustainable dyes on cotton fabrics. Sustainable dyes are ecofriendly, biodegradable, economical and easily attainable from natural sources. The findings of this research established that good colourfastness properties of cellulosic fibres could be obtained using sustainable natural dyes. Experiments were carried out on 100% cotton voile fabrics of plain weave using four types of natural dyes: strawberry dye, beetroot dye, rose dye and China rose dye. Strawberry dye reacted with the cellulose of the cotton in an alkaline condition to form a stable covalent bond amid the dye and cellulose and showed outstanding colour fastness properties. The required experiments were conducted using the standard specified by ASTM and AATCC as stated in this paper. The colour strength properties, colour intensity properties, colour absorbency properties and colorfastness properties were investigated using a refl...
In this colorful world, the beauty of dreams is effervesced by hundreds of man-made dyes on which Reactive dyes is in crest position. Maximum natural textile substrates are wafted by this pukka reaction-based dye. The exercise of this dye is progressed in an elevated celerity for its moderate to good light fastness, simple and variant dyeing methods and apparition of many bright colors. Over and above, Reactive dyes inflict good wash fastness at wet processing. Still sometimes buyers make assertions about bad wash fastness of reactive dyes for inadequate removal of unreacted and hydrolyzed dyes from surface of the substrates. The volition of dyes in this case is very important. A trichromatic mixture of dyes of same reactive group is always preferred. But recently metamerism becomes a big prerequisite for many renowned buyers to maintain. In those cases, dyes of same reactive group cannot be conserved. Therefore outcome on color fastness to wash, tonally change and color strength during washing becomes unknown. In this paper, this incognito effect is tried to be investigated a little. Dyeing is performed by mixing dyes of same functional group and different functional groups. Then color fastness to wash at different stages is observed.
IJASOS- International E-journal of Advances in Social Sciences, 2015
Humans have been using plant-based dyestuff for centuries as the main provider of dyes for industrial products such as textiles, food, leather, etc. Specifically in Turkey, such plants have been used for the dyeing of the fibre and yarn of cotton, wool and silk used in handicraft products, such as carpets, rugs, fabrics, etc. With the discovery of synthetic dyestuffs in the mid-19 th century, natural dyes, and thus, natural dyeing, gradually lost importance, although today, plant-based dyestuffs are again gaining popularity as a result of the rising popularity of the natural and the sustainable concept. The purpose of the present study is to investigate the dyeing effect of solutions obtained from gallnut dyestuffs and mordants from whey, yeast, lye and mushroom extract, with the intention being to identify light, crock and wash fastness levels and examine their usability in today's textile sector. Dyeing cotton fabric samples with gallnut dyestuffs and natural mordants has allowed some important conclusions to be drawn with respect to human and environmental health.