lighter knot..
Still is. I use them all the time. Great for getting a fire started. Red cedar is also good since it contains a good bit of cedar oil.
Not all pine stumps turn into lighter. Seems like those trees cut in the winter when the pine sap is mostly on the roots will form lighter stumps, whereas those cut in warm weather will just rot. Lighter stumps are harvested, placed in huge pressure cookers where the steam forces the turpentine out, then sold as "steam turpentine".
Red