铬酸铵是一种黄色单斜结晶，分子式为(NH₄)₂CrO₄，溶于水，遇热会分解，长期放置会分解放出氨。铬酸铵主要可以当作媒染剂、催化剂、缓蚀剂等等。

• 重铬酸铵

Ammonium chromate is a salt with the formula (NH₄)₂CrO₄. It forms yellow, monoclinic crystals; made from ammonium hydroxide and ammonium dichromate; used in photography as a sensitizer for gelatin coatings. It's often used in photography, textile printing, and fixing chromate dyes on wool. It is also used as an analytical reagent, catalyst, and corrosion inhibitor. It is soluble in water, and, when applied, can cause irritation in the mucous membrane, eyes, respiratory tract, skin, etc. It may cause skin sensitization after prolonged contact. It is also known to be carcinogenic (cancer-causing), and it can cause tissue ulceration and injury to the liver and kidneys.