"Scott Lurndal" > wrote in message ...
> Whitney Ryan > writes:
> >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
>
> Every grocery store I've patronized carries
> both "food grade cornstarch"[*] and cream of tartar.
>
> Check the flour section for the former, and the
> spice rack for the CoT.
>
>[*] Used to work on the line bagging starch in 100#
> bags. For food grade, we had to wear a hairnet.

Just bought some yesterday...
www.argostarch.com
Walmart
15oz
$1.67