Oxidation and Reduction in Light Fading of Dyes

Giles, C. H.; Shah, C. D.; Watts, William E.; Sinclair, Roy S.

doi:10.1111/j.1478-4408.1972.tb03052.x

Cited by 46 publications

(11 citation statements)

References 13 publications

(2 reference statements)

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“…Different shades were obtained by using various pH values. It produced different shades ranging from brown (at pH 1, 3,5) to gray (at pH 7,9,11). Thus, a wide range of shades was obtained from a single source of dye.…”

Section: Dyeing Methodsmentioning

confidence: 99%

“…It is clear that K/S decreases considerably throughout the pH range(1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11) used. This indicates that the pH values of the dye bath are important parameters that affect the color strength significantly.…”

mentioning

confidence: 99%

“…) represents the color strength (K/S) values which are taken as a measure for the dyeability of the dyed silk fabric samples with Vervain dye against different pH values(1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11). It is clear that K/S decreases considerably throughout the pH range(1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11) used.…”

mentioning

confidence: 99%

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Optimization of Dyeing Performance of an Eco Friendly Natural Dye “Vervain Barks” applied to Silk Fabrics at Different pH Values

Al-Amoudi

Osman

2009

Research Journal of Textile and Apparel

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The present study is carried out to optimize the dyeing conditions for silk fabrics using a new natural dye, Vervain barks at different pH values in the absence of mordants. Also, experiments are implemented to investigate the effects of processing conditions on color difference, color scale, color strength and light fastness characteristics. The changes in the morphology of the silk fabric surface after dyeing are studied using a scanning electron microscope. The pH in the acidic range 1-5 is optimum for dyeing, showing very good fastness properties for silk dyed fabrics.

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Section: Dyeing Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Optimization of Dyeing Performance of an Eco Friendly Natural Dye “Vervain Barks” applied to Silk Fabrics at Different pH Values

Al-Amoudi

Osman

2009

Research Journal of Textile and Apparel

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“…Color change in low-oxygen conditions has been further investigated for a variety of colorants (e.g. Giles et al, 1972;Arney et al, 1979;Buss & Crews, 2000;Korenberg, 2008;Casella, 2009). Although demonstrating reduced color change for many samples exposed to light in anoxia, these studies have also revealed for some materials the potential for accelerated color change in low-oxygen environments.…”

Section: Introductionmentioning

confidence: 99%

Large-scale assessment of light-induced color change in air and anoxic environments

Beltran

Druzik

Maekawa

2012

Studies in Conservation

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A wide-ranging sample set consisting of dry pigments, dyed textiles, organic and aniline-based dyes, gouaches and watercolors, fluorescent inks, and natural history specimens was exposed to light in air (20.9% oxygen) and near-anoxic environments. After a light dosage of approximately 17.5 Mlux-hours under controlled temperature and humidity conditions, 113 of 125 samples (90% of the sample set) were shown to exhibit less color change in a low-oxygen environment compared with its behavior in air. Thirtynine percent of this subset displayed color change in anoxia that was between two and four times lower than that observed in air, whereas 47% showed color change in anoxia reduced by a factor of four or more. In contrast, six samples exhibited greater color change in anoxia than in airthese samples included Prussian blue watercolor (three samples), Antwerp blue watercolor, Verdigris dry pigment, and Fluorescent Yellow Winsor & Newton Gouache. Although the results from this small sample subset may cause concern when considering the use of anoxia in the conservation of cultural heritage, particularly for colorant systems whose behavior in anoxia has not yet been identified, this study demonstrates the overwhelming benefits of anoxic light exposure for the vast majority of samples investigated here.

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“…They compared the Hammett U-value of the substituent group in benzeneazo-R-acid dyes with their fading rates, measured spectrophotometrically, on wool and gelatin, and found there is a linear relation. 9 have shown that with free access of air, the same azo dyes on polypropylene and nylon fade by an oxidative mechanism; while in the absence of air, but in the presence of water, they show considerably retarded fading indicating that reduction has occurred. -NOZ, accelerate fading, and electron-repelling ones, e.g.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of light fading of dyes on cellophane and poly(ethylene terephthalate)

Shah¹,

Srinivasan²

1977

J. Appl. Chem.

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Studies of relative rates of fading of dyes and Hammett σ‐value of substituents in their molecules lead to further evidence that fading of azo dyes on Cellophane and poly‐(ethylene terephthalate) is probably an oxidation type of reaction. Absorption spectra of the same dye on these two substrates tend to indicate a very high state of aggregation of dyes on Cellophane as compared to that on poly(ethylene terephthalate).

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Oxidation and Reduction in Light Fading of Dyes

Cited by 46 publications

References 13 publications

Optimization of Dyeing Performance of an Eco Friendly Natural Dye “Vervain Barks” applied to Silk Fabrics at Different pH Values

Optimization of Dyeing Performance of an Eco Friendly Natural Dye “Vervain Barks” applied to Silk Fabrics at Different pH Values

Large-scale assessment of light-induced color change in air and anoxic environments

Mechanism of light fading of dyes on cellophane and poly(ethylene terephthalate)

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