Abstract:
Natural dyes have gained importance due to the growing environmental awareness and
implementation of stringent regulations in production and use of synthetic dyes. This scenario
necessitated the present investigation on bio-dyes Therefore, to address some of these issues a
study was conducted to produce natural dye and evaluate the efficiency of dyeing on sheep
crust. Flower of B. macroptera and leaves of E.camaldulensis were extracted with n-hexane, nhexane:
chloroform 1:1, methanol: chloroform 1:1and methanol. The dyes produced from
B.macroptera and E.camaldulensiswere analyzed by TLC, FTIR, Column
Chromatography,UV-Visible spectrophotometer and GC-MS.The color
coordinates(L*a*b*and ΔE*ab) and lead metal were determined by color meter and ICPOES,
respectivelyas well aswash, light, rub and perspiration fastness values were determined by
color fastness tester. The results of the study revealed that methanol extract showed goodyields
of 34.3% and 32.9% for B. macroptera and E. camaldulensis, respectively. The Rf values for
both plant extracts were 54.4 and 52.2 for commercial dye. The FTIR result showed primary
amine C-N stretching group in plant extract as well as in commercial dye.
Spectrophotometrically, the extracted dye and novocol dye showed yellow color with
absorption spectrum of 436nm, 449nm, 450nm for novocol, E.camaldulensis and
B.macroptera, respectively. Color bearing compounds such as ellagicacid, quercetinand gallic
acid (Benzoicacid,3.4.5-trihdroxy) obtained fromE. camaldulensisandlutein from
B.Macropterawhile6-Amino.1,4-diazoanthraquinone obtained from commercial dye. The dyed
leather from plant extract were showed better color fastness propertiesand the rating was
recorded from very good to excellent and freeof lead metal wereobtained . value of b*
(yellowness, 52.82,49.2),a*(redness,21.7,11.2)and ΔE*ab(35.57,26.17)forB. macroptera andE.
camaldulensisrespectivelywhich implies the B. macroptera produced yellowish orange and E.
camaldulensis produced yellow color with full capacity of shading and fullness.The results
showed that natural dye from E. camaldulensis leafandB. macroptera flowers extract have
potential applications for leather dyeing.
Keywords:Natural dyes, Eucalyptus camaldulensis and Bidensmacroptera (Adey Ababa)