[luv-talk] Any wet chemists, nitric acid on a tree stump

Hello All, I have several willow tree stumps that I wish to remove. As they are in ground where I want to put the footings for a carport, and wish the ground relatively undisturbed, I do not want to dig them out, or have them ground up. I do know that Nitric Acid will convert the cellulose to cellulose nitrate, gun cotton, but I am looking for a way to not have all the cellulose to go that way, I want it to burn, not go bang. I have read somewhere about a suitable mix poured into holes drilled into the stump, and I do recall the Nitric acid, and that there was something else. If anyone can make suitable suggestions, or point to the process, I would be very grateful. Regards, Mark Trickett