1. Compared with casserole, the properties of iron pot are not so stable. After the temperature rises, some active iron ions will dissolve in water and enter the donkey-hide gelatin, which will affect the function of the donkey-hide gelatin.

2. The nature of the iron pot is not stable enough, and it is easy to dissolve iron ions in the solution environment. Moreover, if other stirred things hit the iron pot, iron elements will also be brought out, and iron ions will react with some effective components in Ejiao, resulting in the weakening of the efficacy of Ejiao.

3. It is best to use a casserole at home. Casserole is made of clay, with many small pores in the middle, which is heated evenly and conveniently, and Ejiao will not paste the pot if it is heated unevenly. Moreover, the casserole has a good heat preservation effect, which can ensure the temperature of Ejiao and will not solidify quickly.