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Lime as an interior for cob oven

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Hi Guys,

Cob oven question.

I found what I thought was "sand" to use to build a cob oven, but it turns out that it is likely to be a mix of lime and sand. It's a white powder, and sticky when wet and easily washable. I've already made a batch of cob with it and right now, it is looking like a very white cob.

I've seen this lime plaster used externally on cob ovens. But little info on lime plaster internally, or incorporating a significant amount of lime together with your cob where it will be in direct contact with the heating surfaces. (Expecting oven temps to get to about 500-600 degrees Celsius)

I'm just slightly concerned from a safety perspective. I don't want to be using anything that could leach into food that is being cooked etc.

Otherwise I'm probably going to redo the whole thing with proper "brown cob".

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