I need it for a recipe and thats the only place open after the hurricane in NJ.
Cream of tartar is a by-product of the wine industry. A crystalline acid forms on the inside of wine barrels. The barrels are scraped and the sediment is purified and ground to form cream of tartar. Cream of tartar is used to stabilize egg whites when making meringue or as an addition to certain frostings to produce a creamy product.