ooo, I can not imagine Woolite restoring color.
So the way I understand it is that certain colors fade faster than others (there is a thread around here somewhere).
Cyan and red fades faster than other colors, so a true blue bag will have those plus greens in it.
Once some colors start fading, the other colors are more visible, KWIM??
So a once blue bag, after loosing some of it's red may look darker/less bright.
Sorry....