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Post by arghvark on Dec 17, 2019 12:51:34 GMT -5
Was given a turkey roaster. This is the result of the first experiment with heat treating. Highest temp recorded was 473°F. This is with a digital infrared thermometer on the top surface of the sand filling the roaster, underneath a piece of fiberglass insulation. About 2" above the buried stones. Guessing the rocks were at least somewhat hotter. Two consecutive slabs from the same rock, surfaces shown are either side of one cut. [ETA: Upon further inspection these are not adjacent faces but they are consecutive slabs.] The lower one (darker) is the cooked one. Don't know whether the surface was darkened by contact with sand while cooking. Suspect it was. Had a few chunks in there as well, will break one and see what the inside looks like. There does seem to be some difference in texture on the uncut surfaces. The slabs have a distinct difference in sound when tapped with a other rock. The cooked one "rings" more, with a higher pitch. Sounds more like pet wood than the uncooked slab. Since I don't have cabbing set up yet, will tumble a few cooked chunks to see what it gives. Next step: cut a piece of insulation that fits the top of the roaster better to try to get a few more degrees out of it. Don't want to cook without the ceramic liner because I'm doing this in the garage and I'm paranoid. Cooking without the liner outdoors will wait until the weather warms up. Argh
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Luminin
spending too much on rocks
Member since August 2017
Posts: 400
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Post by Luminin on Dec 18, 2019 15:44:30 GMT -5
Very interesting! I know heat treating flint is big, never thought about other material. Heat treating flight alters the colors and hardness. Knappers heat treat flint to make it easier/better to work as well. Maybe it alters the silica? Makes it ring almost like a bell.
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