I have used this before, a million years ago. The jar is probably still sitting there in my mom's cupboard.
Instead of driving 5000 miles to retrieve it and come back home to bake a cake, I bought a new jar.
You could probably use it as a prop in a movie. Cocaine anyone?
Looking for it in Larousse Gastronomique, I found it under
A brownish-red crystalline deposit left inside wine casks after racking. This byproduct of wine consists mainly crude potassium hydrogen tartrate, which, when purified, gives cream of tartar, used in baking.Spice Islands Cream of Tartar, available in the spice racks of the baking aisle at Ralph's for $4.99 a 3-oz jar.