I call it the gravy point..when the last third of the pipe takes off sizzling...
I figure its the last bit of moisture being heated...and Its always a signal to me that
its about done, then pushing it much beyond that point..seems to be a worth less than
the effort it takes to chase the burn all the way down.
..But I do chase it every handful of smokes...to bake the bottom.
One of my estate pipes has a well burnt in to the bottom presumably from the PO bottom smoking..
I always get a kernel out of that one.
Well haha..way to technical..Smoke up! They will make more!.