i have noticed it for a number of days now, but not sure if it has always been like that or not. generally my stool is on the lighter side of drown, depending on what i eat, so any dark bits show up. the best way i can describe it would be like looking like bits of grit, some bigger than others. if i can isolate a bit on the paper it can crumble down almost sometimes, not all the time, kind of in a charcole sort of colour/texture... by tarry do you mean something that still have some moisture to it also, gooey almost? as oppose to dry.