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 to not become crumbly, hardened, dried or have too squishy a texture. Sandwich bread can refer to cross-sectionally square, sliced white and wheat bread, which has been described as "perfectly designed for holding square luncheon meat". The bread used for preparing finger sandwiches is sometimes referred to as sandwich bread. "Pan de mie" is a sandwich loaf. Some sandwich breads are designed for use in the creation of specific types of sandwiches, such as the submarine sandwich. For barbecuing, use of a high-quality white sandwich bread has been described as suitable for toasting over a fire. Gluten-free sandwich bread may