This is the elbow 4' up from the stove there is some shiney stuff but its all dry and crumbles of when touched just worried about the liner now, don't have stuff to sweep right now but cleaned up the stove pipe. How bad of shape am I in? I know it's not good but is it dangerous? My wood is all 9 months to one year CSS dead ash, burns very good I get 700 at peak every reload. Only thing I can think is the shoulder season (small cool fires) and me figuring out how to run the stove caused this. Thanks for any help