Bread made in not-kosher bakeries can be assumed to be kosher ONLY if:
  1.  It has no ingredients other than flour, water, yeast, and salt. French baguettes and some other breads are OK, as are many breads baked in other countries of the same type.
  2.  It is baked on a hearth and not in a pan.
Note On a hearth, any non-kosher ingredients from other baked foods get burned up.
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