Shígāo hé lǔshuǐ dōu shì chángjiàn de dòufu nínggùjì.
Gypsum and nigari are both common tofu coagulants.
Tips
usage
剂 is the generic suffix for 'agent' in Chinese chemistry and pharmacy: 凝固剂 coagulant, 防腐剂 preservative, 添加剂 additive, 抗结剂 anti-caking agent. Recognizing the pattern X+剂 lets you parse new food-label terms.