Dyeing mesta (Hibiscus sabdariffa) fibre with natural colourant
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Date
2009
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Publisher
UAS, Dharwad
Abstract
The present study was carried out during the period 2008-09. The main objectives of
the study were to study the morphology of Mesta fibre, to optimize the dyeing conditions
using natural colourant and to assess the colourstrength and colourfastness properties of dyed
samples for washing, crocking and sunlight.
Mesta fibres were procured from Institute of Organic Farming Unit, University of
Agricultural Sciences, Dharwad. Fully ripened fresh Mesta calyces were collected from
Organic Farming Field, Main Agricultural Research Station, University of Agricultural
Sciences, Dharwad and shade dried. Mesta fibres were observed for longitudinal view
visually under microscope. The dyeing conditions like dye extraction media, dye extraction
time, wavelength, dye concentration, dyeing time, dyeing temperature, mordanting time were
optimized. Colourstrength values of dyed samples were obtained. Colourfastness tests to
washing, crocking, and sunlight were carried out and assessed using grey scale and standard
wool pattern.
Results revealed that fine longitudinal striations were observed throughout the fibre
width under the projection microscope. Acidic media (pH – 4), 45 minutes dye extraction
time, 6 per cent dye concentration, 30 minutes of dyeing time, 80° c dyeing temperature, pre
mordanting time for Potash alum, Copper sulphate, Ferrous sulphate was 45 minutes and 15
minutes for Stannous chloride, 45 minutes simultaneous mordanting time for all the mordants
and post mordanting time for Stannous chloride was 45 minutes and 30 minutes for Potash
alum, Ferrous sulphate and 15 minutes for Copper sulphate were optimized at 400
wavelength( ) for dyeing Mesta fibre with Mesta calyces extract. The colourstrength values
of pre, simultaneous and post mordanted samples were found to be increased compared to
control sample. Colourfastness of all the dyed samples were ranged between good to
excellent. Mesta fibre pre mordanted with 3 per cent Ferrous sulphate sample exhibited
excellent fastness properties to washing, crocking and sunlight.