Originally Posted by xmascarol1
If I'm not mistaken, I'm thinking that Double Action baking powder indicates that it works first like single action, in that one of the ingredients starts to work as soon as the batter is mixed, and then the other part of the powder sets to work with the heat as you indicated. .
At least that's the way I've always thought it worked. Correct me if I'm wrong.
This is correct. Double acting, as its name indicates, acts twice. Once with the addition of a liquid and again with the application of heat.
No batter with baking powder (either type) can be mixed for use the next day and produce successful results.