Why is hollow bread good bread? how do you get the dough just right?!

Question: When you make bread, why is it a good thing if u knock the bottom of it and its hollow?

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Answers: When you make bread, why is it a good thing if u knock the bottom of it and its hollow?

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That is for testing doneness. After it is baked, people say if you knock the bottom it should sound hollow, that's to make sure that it is fully baked, I think that started because if the center is still doughy, then it won't sound hollow, and I'm not sure exactly how that works out.

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its moldy bread but its sanitised i prefer not to eat it

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