A baking powder blend is provided which is a composition comprising potassium bicarbonate and an acidulant, said composition having a particle size substantially all less than 500µ, wherein at least one of said bicarbonate and said acidulant is coated with an anti-caking agent comprising an anionic or amphoteric surfactant. Loss of carbon dioxide in the blend is inhibited by the coating with surfactant. Combination of the surfactant coating with an inorganic anti-caking agent such as silicon dioxide gives synergistic protection against caking of the potassium bicarbonate. Preferably the bicarbonate has D50 of between 35 and 200µ and is free from particles greater than 400µ.
