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
Bread in Europe rise. Another traditional Irish bread is barmbrack, a yeasted bread with added sultanas and raisins, customarily consumed at Halloween. Potato bread is also traditional in Ireland, especially in Ulster. Many new types of bread have reached the markets in Norway in recent years. A high percentage of people reported regularly eating bread types such as spelt, speciality, gourmet, and fibre/bran bread, as well as ciabattas and baguettes, although very few reported doing so on a daily basis. Norwegian bakers now have competition from abroad. The wholegrain bread from local bakers must give way to huge lorry loads of baguettes and