ATM is a white crystalline power,easily effloresce in air,Slightly soluble in water,Soluble in ammonia water and alkalies. 四钼酸铵为白色结晶性粉末,在空气中易风化,微溶于水,溶于碱和氨水。
In chemistry, efflorescence (which means "to flower out" in French) is the migration of a salt to the surface of a porous material, where it forms a coating. The essential process comprises the dissolving of an internally held salt in water, or occasionally in another solvent. The water, with the salt now held in solution, migrates to the surface, then evaporates, leaving a coating of the salt.