Baker's yeast. Fresh yeast. A strain of yeast which is particularly suited to bread-making. It is available in a crumbly solid cake. Must be fresh to work effectively.
A raising agent used to make a baked mixture light. Baking powder consists of bicarbonate of soda (US: baking soda) and cream of tartar which, if mixed with flour or starch, assists pastry and cake doughs to rise, as when it meets moisture it produces carbon dioxide which aerates and lightens the dough.
