I'm on Day 8 as well. Mine have just been brown, and a lemon yellow liquid. Kinda powdery... looks like some mucus in there as well. I'm going for a colonic today to clean out all the nooks and crannys.
I eat healthy most of the time, so I'm hoping my lack of "black" matter is due to this.
I can say that my body doesn't ache as much. My chronic shoulder pain is now no longer chronic.