The complex produced by wool protein, the lutein, a major
carotenoid compound present in Marigold, and aluminium
salt is illustrated in Figure 2(a). The changes occurring in the
complex after treatment with ammonia is proposed in Figure
2(b).
The color hue of the Marigold-dyed yarns was changed and
a small amount of Marigold bled from the dyed yarns after
treated with ammonia. The change in color hue of Marigold
was also observed in the remaining ammonia solution. It can
be seen from Figure 3 that an increase in the concentration of
ammonia on the Marigold dyed wool yarns leads to prolonged
decrease of reflectance spectra at different wavelengths.
The results of color measurement of ammonia-treated wool
yarns dyed with Marigold are shown in Table 1 and Figures 4
and 5. It can be seen from Figures 4 and 5 that the amount of
L* decreases after the Marigold dyed sample treated with 1%
ammonia solution but the amount of a* (redness) increases.
By increasing the percentage of ammonia, the amount of L*
and a* continued to decrease and increase, respectively.
According to Figure 5, the corresponding b* value increases
due to ammonia treatment. It can be also observed (Table 1)
that the C* value for Marigold dyed sample increases after
ammonia treatment that means the shade became brighter.