Papers by Keyword: Mordant

Abstract: Natural dye solution from longan leaves was applied to the simultaneous dyeing of silk fabric and using alum, copper sulfate, ferrous sulfate and stannous chloride as a mordanting agents. The dyeing properties and effects of simutaneous-mordanting on the hue, colour strength and colour value were revealed. The results show that The K/S values increased with an increase of metal mordant concentration. The mordant activity sequence was CuSO₄> FeSO₄> AlK(SO₄)₂ > SnCl₂. The obtained colour values show that silk fabrics dyed without mordant exhibited dark brown colour, while those mordanted with aluminum potassium sulfate (alum), stannous chloride and copper sulfate showed a variety of medium to dark brown shades. With ferrous sulfate, the colour shade was darker and duller. The colour fastness results showed good to very good level.

Abstract: Natural dye solution from longan leaves was applied to the simultaneous dyeing of silk fabric and using alum, copper sulfate, ferrous sulfate and stannous chloride as a mordanting agents. The dyeing properties and effects of simultaneous-mordanting on the hue, colour strength and colour value were revealed. The results show that The K/S values increased with an increase of metal mordant concentration. The mordant activity sequence was CuSO₄> FeSO₄> AlK(SO₄)₂ > SnCl₂. The obtained colour values show that silk fabrics dyed without mordant exhibited dark brown colour, while those mordanted with aluminum potassium sulfate (alum), stannous chloride and copper sulfate showed a variety of medium to dark brown shades. With ferrous sulfate, the colour shade was darker and duller. The colour fastness results showed good to very good level.

Abstract: The present paper deals with the application of natural dyes extracted from cassia fistula fruit or golden shower tree seed pods on nylon fabric. The dyeing properties were evaluated by measuring K/S and CIELAB values. In addition, the different fastness properties were evaluated. The effect of metal mordants at different concentration levels with respect to their colour strength was also studied. Nylon fabrics dyed with golden shower tree seed pods extract without mordant showed a light brownish-yellow shade, while those dyed with ferrous sulfate and stannous chloride brighter brownish-yellow colour. Nylon substate dyed with alum and CuSO₄ gave a duller brownish-yellow colour. The fastness properties ranged from fair to good level.

Abstract: Two lichens species (Parmotrema praesorediosum and Heterodermia leucomelos) were assessed for dye production using boiling water method (BWM) and ammonia fermentation method (AFM). The dyes were applied on silk fabric. Three types of mordant were used i.e. alum, iron and vinegar through meta-chrome (simultaneous) method of natural dyeing. The K/S values, colour coordinates values and colour differences (ΔE) of the dyed samples were measured. Dyeing fastness properties of the dyed silk fabrics were assessed for washing, rubbing and light. The P. praesorediosum extracts yielded beige to dull brown shades using BWM and pinkish-purple using AFM, whereas the H. leucomelos extracts produced yellowish-brown shades for both BWM and AFM on the silk substrate. Modanting seemed to be effective in increasing the K/S values of all mordanted fabrics except in the case of silk fabric dyed with P. praesorediosum extracted from AFM. Fastness ratings to washing and rubbing were all very good (5-4) for both P. praesorediosum and H. leucomelos dyed silk fabrics. The fabrics dyed with P. praesorediosum and H. leucomelos extracts produced strong and deep colours as their ΔE values were higher and increased obviously of all mordanted fabrics. It can be concluded that P. praesorediosum and H. leucomelos extracted from BWM and AFM methods can be used as an alternative dye source.

Abstract: This research work was concerned with the stability of cacao dye and the application of this dye for cotton fabric dyeing by two techniques, namely direct dyeing and mordanting. The optimal conditions for cotton direct dyeing with cacao dye were carried out at 100°C for 60 min. It was observed that with an increase in the dye concentration, the ultraviolet protection factor values ranged good for cotton fabric. The results confirmed that natural dye have potential applications for fabric dyeing and producing UV protective cotton fabric.

Abstract: A natural dye extracted from purple corn cob was applied to a silk fabric using pre-mordanting method, under different conditions. It was observed that with an increase in the dye concentration, the ultraviolet (UV) protection factor (UPF) values ranged between good and very good for the silk fabric. In addition, a darker colour, such as that provided by a FeSO₄ and CuSO₄ mordant, gave better protection because of higher UV absorption. Silk fabrics dyed with purple corn cob extract showed a light violetish-pink shade, while those dyed with alum violetish-pink colour. Silk substrates dyed with CuSO₄ gave a green to greenish-pink colour, while those dyed with FeSO₄ had a light yellow to violetish-gray colour. The results confirmed that natural dyes from purple corn cob extract with metal mordants have potential applications in fabric dyeing and in producing UV-protective silk fabrics.

Abstract: The colour activity of silk fabric dyed with natural dye extraction from the purple corn cob by post-mordanting was studied. The effect of dyes at different metal mordants concentration levels on their colour strength was also investigated. Silk fabrics dyed with purple corn cob extract showed light violetish-pink shade, while those dyed with alum violetish-pink colour. Silk substrates dyed with CuSO₄ gave a gray colour, while those dyed with FeSO₄ had a violetish-pink colour. The fastness properties showed fair to very good rating.

Abstract: Natural dye extracted from longan leaves was applied to a silk fabric by exhaustion dyeing process. Aluminium potassium sulfate, ferrous sulfate, copper sulfate, and stannous chloride were used as mordants. The dyeing was conducted with and without metallic salt mordants, using pre-mordanting method. Silk fabric dyed in a solution composed of a longan from leaves without mordant showed a shade of pale yellowish-brown, while those mordanted with stannous chloride, alum, and copper sulfate produced a variety of medium to dark yellowish-brown colour shades. However, duller and darker brown shade was obtained with ferrous sulfate mordant. The colour fastness to washing, water, and rubbing were good to very good. The light fastness results showed fair level.

Abstract: The eco-friendly dyeing of silk fabric with sodium copper chlorophyll was studied. Silk fabric was firstly dyed using a non-mordanting method, and two factors (dyeing temperature and pH) were optimized. Then silk fabric was dyed using different mordanting methods. The results showed that pre-mordanting was the best method which gave the highest color depth. In the pre-mordanting dyeing process, the effects of the category and dosage of mordants, and the temperature, pH and time of mordanting on the color depth of silk were discussed. The satisfactory color depth of silk fabric was found to be obtained at a lower mordant dosage and dyeing temperature, and a weakly acidic medium when ferrous sulfate was used as a mordant.

Abstract: Gardenia yellow was applied to dye silk by mordant and direct dyeing methods. The post-mordanting dyeing exhibited the highest color depth. The effects of the categories and dosages of mordant, and the temperature, pH and time of mordanting on the color depth of the dyed silk were discussed in the post-mordanting process. Results showed that the satisfactory color depth was achieved when zinc sulfate was used as a mordant. Additionally, a low dosage of mordant, low mordanting temperature and a weakly acid medium were found to give good dyeing effects.