Fat lighter is cool stuff Gary, great to see the grandkids making such a wonderful discovery. With a little fat, you can start a fire under just about any weather conditions. I cut some old cat faced turpentine trees that had mostly turned to lighter for some yankees that had moved here and they were just fascinated by it. They had never seen or heard of it. There are still a few stumping outfits around that dig fat lighter stumps for explosives and turpentine. A stick of it we call "fat lighter". A knot we call (like you) a "lightard knot" which is super hard, almost pure pine rosin. Those kids better watch having that lit lighter over their heads, that hot, molten sap will drip out and make 'em holler for grandma!