Bread unpredictable since the steam is not produced until the bread is baked. Steam leavening happens regardless of the raising agents (baking soda, yeast, baking powder, sour dough, beaten egg white) included in the mix. The leavening agent either contains air bubbles or generates carbon dioxide. The heat vaporises the water from the inner surface of the bubbles within the dough. The steam expands and makes the bread rise. This is the main factor in the rising of bread once it has been put in the oven. CO generation, on its own, is too small to account for the rise. Heat
History of California bread artisan markets and large chains like Safeway or Nob Hill, and seek reasonable expansion. A good example is Sumano's Bakery in Watsonville, California, near Monterey. They produce a classic sourdough loaf with wheat flour, water, starter,and sea salt. Another, which is smaller and delivers only to small artisan markets but which will ship, is the 80-year-old Arcangeli Grocery Company / Norm's Market in historic Pescadero California famous for their Artichoke Garlic Bread among 40 other unique artisan breads, San Luis Sourdough in San Luis Obispo was founded in 1983, and makes sourdough bread with only the basic ingredients. In 1987,