I guess a heavier-gauge material helps keep the temperature up while opening the oven, and potentially with immediate heat transfer to the dough, but the sealed environment is I guess most important for oven spring etc.
@Thrustvector started
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I guess a heavier-gauge material helps keep the temperature up while opening the oven, and potentially with immediate heat transfer to the dough, but the sealed environment is I guess most important for oven spring etc.