good double acting leavening agent
Double-acting baking powders contain both fast- and slow-acting acids. You would have to get the ingredients from a chemical supply house. Note: cream of tartar as an ingredient has not been included for decades.
As for the formulation, I don't think that there is one available.
A homemade version of single acting baking powder
2 tablespoons cream of tartar
1 tablespoon baking soda
1 tablespoon cornstarch
Rumford double acting baking powder:
Rumford Baking Powder Ingredients: Monocalcium Phosphate, Sodium Bicarbonate (Baking Soda), Food-Grade Cornstarch (Non-GMO "not genetically modified")
http://www.yankeeharvest.com/rumford_baking.html
HTH
Rumford Baking Powder Ingredients: Monocalcium Phosphate, Sodium Bicarbonate (Baking Soda), Food-Grade Cornstarch (Non-GMO "not genetically modified")
Rumford Baking Powder Ingredients include both Monocalcium phosphate (calcium acid phosphate) and anhydrous monocalcium phosphate [another form of monocalcium phosphate] which is treated as another acid. The presence of both these acids makes it a double-acting baking powder.
A double acting has an added or sometimes two acids such as monocalcium phosphate and sodium acid pyrophosphate or sodium aluminum phosphate; salt acids such as potassium bitartrate aka cream of tartar only offers a single rise. Adding the monocalcium phosphate might make it a double acting I just don't know how much would work 
Any advice 
A double acting has an added or sometimes two acids such as monocalcium phosphate and sodium acid pyrophosphate or sodium aluminum phosphate; salt acids such as potassium bitartrate aka cream of tartar only offers a single rise. Adding the monocalcium phosphate might make it a double acting I just don't know how much would work
Any advice
Can anyone else help ?
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