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Old 04-05-2013, 10:50 AM   #11
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Well, if it were actually a stone and not pottery, it shouldn't have any added lead, etc.
A real concern about stone is if it is dry. You stick a wet stone in the oven and let it get to 550F and it will explode.

Dry means geologically, not just surface dryness. I put a charcoal chimney full of coals down on our new patio while dealing with the other. Took about 20 seconds for the surface to explode. There is now a round indention in the stone. Thankfully this is not a smooth stone thing so it blends okish.
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Old 04-05-2013, 11:11 AM   #12
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A real concern about stone is if it is dry. You stick a wet stone in the oven and let it get to 550F and it will explode.

Dry means geologically, not just surface dryness. I put a charcoal chimney full of coals down on our new patio while dealing with the other. Took about 20 seconds for the surface to explode. There is now a round indention in the stone. Thankfully this is not a smooth stone thing so it blends okish.
That's why you aren't supposed to build fireplaces/chimneys with river stones.
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Old 04-05-2013, 11:24 AM   #13
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...Dry means geologically, not just surface dryness...

Can you please explain what this means/how you can tell?
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Old 04-05-2013, 11:27 PM   #14
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Thanks everyone. Lead wasn't my only concern. It was just an example. I would like to hear more in this topic. It's very interesting. Sounds like you really need to know what you are doing if you use something other than stones intended for cooking.
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Old 04-05-2013, 11:53 PM   #15
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when i was a young scout, some of the bad kids learned to soak small stones such as slate in water and then toss them into the campfire. it's was just fun for all when they exploded!
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Old 04-06-2013, 01:09 AM   #16
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Can you please explain what this means/how you can tell?
As I understand it means there is no moisture trapped in the stone, even in itty bitty bits. I am not a geologist though.

It was something I read about 3 months before exploding the patio.
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Old 04-06-2013, 10:08 AM   #17
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As I understand it means there is no moisture trapped in the stone, even in itty bitty bits. I am not a geologist though.

It was something I read about 3 months before exploding the patio.
Thanks, Frank. It seems there is no way to know so it's a crap shoot.
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Old 04-06-2013, 11:54 AM   #18
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Would seem unlikely that unfractured igneous rock would contain moisture.
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Old 04-06-2013, 12:45 PM   #19
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I don't know what the patio is, something blueish.

Different rock has different porosity. I was going to take a geology course this semester but it was full when I went to sign up. I took Cultural Geography instead.
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Old 04-06-2013, 02:19 PM   #20
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Would seem unlikely that unfractured igneous rock would contain moisture.
Like pumice?





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