"Whitney Ryan" > wrote in message
...
> Where can one buy food grade cornstarch &
> calcium phosphate?
>
> I bought a ton of Baking Soda at Costco
> (sodium bicarbonate), and I want to make
> a small amount of baking powder.
>
> Baking powder, as far as I can tell, is
> baking soda + cornstarch + "cream of tartar"
> which is usually either calcium phosphate
> or potassium hydrogen tartrate (KC4H5O6).
>
> I went to Safeway, Trader Joes, and Whole
> Foods, but none had the missing ingredients,
> only one of which is required (the cornstarch
> is optional but the acid tartrate is not.
>
> Where can one buy food grade cornstarch &
> calcium phosphate?
>
> Cream of Tartar
>

Cornstarch is available at any grocery store.

So is cream of Tartar, but if I remember right is seems to cost a fortune
for what it is, and is sold in small amounts. Maybe Smart & Final or
Restaurant Depot, etc. sells in larger quantities for a more reasonable
price.