Quick bread leavening process, agents (one or more food-grade chemicals—usually a weak acid and a weak base) are added into the dough during mixing. These agents undergo a chemical reaction to produce carbon dioxide, which increases the baked good's volume and produces a porous structure and lighter texture. Yeast breads often take hours to rise, and the resulting baked good's texture can vary greatly based on external factors such as temperature and humidity. By contrast, breads made with chemical leavening agents are relatively uniform, reliable, and quick. Usually, the resulting baked good is softer and lighter than a traditional yeast bread. Chemical
Sandwich bread be prepared using gluten-free flour, teff flour. and other ingredients. In the 1930s in the United States, the term sandwich loaf referred to sliced bread. In contemporary times, U.S. consumers sometimes refer to white bread such as Wonder Bread as sandwich bread and sandwich loaf. Wonder Bread produced and marketed a bread called Wonder Round sandwich bread, which was designed to be used with round-shaped cold cuts and other fillings such as eggs and hamburgers, but it was discontinued due to low consumer demand. American sandwich breads have historically included some fat derived from the use of milk or oil