Thats the paint coming off the old concrete
This is a 1926 model house that we are completely redoing down to the studs LOL
So the old concrete does have some stains and paint but nothing bad. We had to redo the roof and all gutters after a bad hail storm so any future probs with water seepage should be eliminated by that.
Its all good at this time, these pics just SUCK

not to mention its a room in the works too