How to Heat Treat a Knapping Stone
- 1). Dig a fire pit deep enough to hold flint, sand and a fire --- about 2 feet deep.
- 2). Line the fire pit with a layer of sand. Place flint stones on top. Cover with a 3-inch layer of sand.
- 3). Cover with charcoal or wood and start a fire. Keep the coals from the fire going for 24 hours. Add more fuel as needed to keep the coals hot during this time.
- 4). Scrape the coals aside. Dig out the sand and recover the flint with 1 inch of sand.
- 5). Cover the sand with coals again and add more fuel to keep the pit hot for 12 hours.
- 6). Let the coals cool down. Leave the stones buried for 48 hours to cool down completely.
- 7). Dig up the stones and test to see if they are heat treated to satisfaction. If not, recover them and repeat the process.
