Food Grade Gypsum Tofu Coagulant Other names: Terra Alba & Calcium Sulfate Includes: 16 Oz. of refined, food grade gypsum Gypsum is naturally occurring calcium sulfate. Super brand is refined and food safe for use as a tofu coagulant. Gypsum is the traditional ingredient used by the Chinese as their tofu coagulant. If you want to use the more traditional Chinese technique for making tofu, this Gypsum is what you want. Gypsum is a strong coagulant that will begin to curdle your hot soymilk immediately and will yield a slightly firmer tofu. To use gypsum as a coagulant dissolve 3 teaspoons of gypsum into about half a cup of hot water, and stir quickly but gently into about 2 quarts of hot soymilk, and allow to curdle and stand for 15 minutes before transferring to a tofu press. Yields over a pound of fresh tofu, depending on firmness.