Different materials: the raw materials of sour bread usually include flour, water, yeast, salt and sour dough starter, while the raw materials of ordinary bread usually include flour, water, yeast and salt. In the process of making sour bread, sour dough starter will participate in the fermentation process, but ordinary bread does not have this step.

Taste is different: Sour bread usually tastes richer than ordinary bread, because the addition of sour dough starter makes bread produce more acidity and flavor substances during fermentation. In addition, the texture of sour bread is softer and more delicate.