Effect of Dye Concentration
Figures 3 and 4 show the effect of dye concentration on
the color strength obtained for the dyed fabrics. As shown,
the K/S value increases as the concentration of the dye
increased up to certain level (ca. 75 and 4 % of madder and
curcumin, respectively), after which the fibers started to
become saturated especially for samples A and B. It is clear
that the dye uptake of modified samples A and B is better at
all concentrations used than that of the blank sample and the
dyeability is ranked as follows: B>A>blank. This result
reflects the extent of fiber modification and in a good
agreement with the nitrogen content of the dyed samples.