"Whitney Ryan" > wrote in message
>> ...
>>> Where can one buy food grade cornstarch &
>>> calcium phosphate?

http://www.thespicehouse.com/spices/cream-of-tartar

Cream of Tartar is also known as tartaric acid. Real cream of tartar
is derived only from the crust on wine casks, where it has
precipitated from the tartaric acid in the grapes.

It has an astringent quality which adds a tartness to foods. To mix
your own baking powder, combine 1/4 teaspoon baking soda with 1/2
teaspoon cream of tartar.

Very Fine Powder, in a resealable bag

1/2 cup shaker jar refill
$3.24

4 oz.
$3.29

8 oz.
$6.29

16 oz.
$11.99