Use Borwicks bicarbonate of soda to give your doughs and batters a rise. Bicarbonate of soda, also known as bicarb, releases carbon dioxide when heated, causing dough and batter to rise. Borwicks bicarb is made from 100% pure sodium bicarbonate, made without any additives or chemicals. Use Borwicks bicarbonate of soda to make cookies, sponge cakes and banana bread.