Released on = February 27, 2006, 1:34 am

Press Release Author = Ms. Papita Saha

Industry = Environment

Press Release Summary = Due to the harmful effects of chemical dye used at the time of dyeing have forced us to concern about the alternative preparation of dye using natural source like flowers, leaves, stem etc. People are using natural sources like stem, bark, leaves etc for dyeing clothes until the invention of synthetic dye "Perkin Mauve"in 1856. Nowadays people are more concerned about the harmful effect of using synthetic dye. West Bengal is the fourth position to cultivate flowers after Andhra Pradesh, Karnataka & Tamilnadu. But a huge amount of unsold flowers are wasted everyday. These unsold flowers create a big problem for disposal as well as these can create environment pollution also. These unsold flowers can be used for dyeing purpose for Textile fibre & residuals can be used as bio-fertilizers also. These flower dyes are eco-friendly also and it has no side effect on skin. An attempt has been made in laboratory scale and as well as in pilot plant using Mari-gold flower for dyeing of textile fibre and to make the technology of the process economically viable.

Press Release Body = The process of extraction of dye from Mari-gold flower is very
easy. The extraction is Aqueous extraction of dye. The temperature for dye extraction from flower is taken as 80 - 85 0C. With increasing time, extraction of dye in aqueous solution is increased, but 2 hr is taken for extraction of dye to make the technology more cost effective. It is also seen that if the aqueous medium is slightly basic, then extraction of dye in water is increasing as the efficiency of extraction process is increasing in presence of basic medium for floral dye. Colour fastness to wash & light & perspiration fastness of the dyed samples are tested using grey scale. The light fastness properties are tested by exposing in normal day light by putting samples behind window glass. The colour change is assessed by using grey scale. The extent of fading is assessed by grey scale. The wash -fastness is also tested using grey scale according to the method IS: 764 - 1984 at 600C for 30 minutes. The results indicate that the colour fastness of thesamples dyeing with Marigold flowers are around 3 - 4 where as 5 is the higher concentration rating. The lower rating may be due to the darkening of shade resulting in higher contrast & so poor rating. From the overall results it is seen that dyeing with alum give better result (both in light fastness & wash fastness) in respect of all other mordant. Stannous chloride used as mordant also gives better results, but the cost of this mordant is too high.


Web Site = http://geocities.com/kusumika_project

Contact Details = Ms. Papita saha.
Lecturer
Biotechnology Department
ITME College
Diamond Harbour
India