When compared with magnesium chloride, a main ingredient in bittern, calcium sulfate had a wider zone in which the proper coagulation reaction occurred (being referred to as the strike zone of coagulation) and made it comparatively easy to make high-quality tofu, which was water-retentive and fine.
硫酸カルシウムはにがりの主成分である塩化マグネシウムと比べ適正な凝固反応が起こるいわゆる凝固のストライクゾーンが広いため、保水性が高く肌理の細かい高品質な豆腐が、比較的容易に作りやすかった。