Cream of Tartar: What It Is and How to Use It | Allrecipes
Jan 19, 2015 · It's a dry, powdery, acidic byproduct of fermenting grapes into wine. Its sciency name is potassium bitartrate, aka potassium hydrogen tartrate or tartaric acid (hence the commercial name). But you can find it in the spice aisle labeled as plain ol' cream of tartar. Cream of Tartar. Photo by Meredith.
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