Tartrates (Mono potassium salt of tartaric acid): reacts readily at room temperature and is relatively expensive.
Phosphates: different sodium acid pyrophosphate powders are available. They vary in their reaction rates, depending upon how they are made.
Monocalcium phosphate: reacts readily at room temperature and is widely used as the fast acting component in double acting baking powders. Phosphate powders react somewhat slower than tartrates at room temperature but still lose a high percentage of their gas before baking.
Sulphates: they give very little gas at room temperature but release all the available gas only at the temperature of the oven.
Ammonium carbonate or bicarbonate: is used in baking biscuits and crackers which are to be baked at low moisture. Either ammonium carbonate or bicarbonate is used in small proportions in certain types of cookies.
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