Improving light fastness of natural dye: photostabilisation of gardenia blue

Abstract

The photofading behaviour of gardenia blue on cellulose was investigated. A contribution of auto‐oxidation and singlet oxygen to that fading was suggested. The inhibiting effect of phenyl ester ultraviolet absorbers towards the photofading of gardenia blue was examined on cellulose. It has been found that the presence of a simple ultraviolet absorber is not of particular value in improving the light fastness of natural dye. The introduction of a singlet oxygen quenching group into an ultraviolet absorber can, however, have an important effect. The nickel complex of 1‐benzoyloxynaphthalene‐3‐sulphonic acid was very effective in reducing the rate of photofading.

<b>An Application of Functional UV Absorbers to Improve</b>

“…NTS was also found to be very effective in suppressing the fading of dyes in visible light [19]. In the above section and previous paper [15], the contribution of singlet oxygen to the photofading of gardenia blue was suggested. Accordingly, the influence of various UV absorbers in the presence of NTS was further investigated on the photofading of this color by irradiation with xenon arc light.…”

“…undergo self-or dye-sensitized photo-oxidation in [14]. In a previous paper, the effect of various kinds of additives on the photofading of gardenia blue was investigated on cellulose [15]. The involvement of free radicals and singlet oxygen has been postulated in the photochemical oxidation of this color.…”

Preparation and Characterization of Water-Insoluble Gardenia Blue Pigment

“…Some researchers have studied the stability of water-soluble gardenia blue pigment, and they found that it was most unstable under light [ 17 , 18 , 19 ]. Others tried to improve the pigments’ stability by adding color fixative, embedding and chemical modifying, and other different kinds of methods [ 20 , 21 , 22 , 23 ].…”

One-step green approach for functional printing and finishing of textiles using silver and gold NPs

“…With such excellent properties, novel shades of elegant hues and excellent multifunctional activities on different textile materials have been achieved. 14,15 Nevertheless, many dyes are not stable under irradiation of sunlight and have low resistance to washing and rubbing, causing color fading. Metal NPs are different from traditional dyes: it is not the chromophore of traditional dyes but the shape and size of NPs that dene the colors.…”