In Fig. 5(B), the contents of red pigments were calculated out
from regression equations in 3.1.2, which were used to describe
the total amount of red pigments obtained from 1 g FRPs in this
work. The contents of red pigments in the extracted solution
showed also significant variation for nine experiments. The contents
of red pigments in group 7, 9 were higher than those of
others. The best one in all groups was group 9, which shows an
about 2.5-fold difference when compared to the lowest group (i.e.,
group 1).