It almost looks like it is in a drippy form but everything that came out was a dry powder of a gray and black form.Done 2 sweeps a month apart and got a small coffee can full both times.Wood was cut this spring so i know it isn't dry but i keep her clean and do a visual up the pipe.Very clean,is the cap ok as long as it doesn't plug?I do have some bigger pieces fall when i run the brush up and tap the cap.1/2" or so pieces.