Authentic Ejiao is a kind of amber or brown-black rectangular flat block at first glance, with smooth shape, neat corners and shiny surface. When viewed through light, the edge of Ejiao block is translucent.

Second, Ejiao is fragile, and it will be fragile with one hand. Small pieces of Ejiao will be dissolved in hot water within half an hour, while Ejiao dissolved in hot water will be frozen into jelly.

After Sanwen and Ejiao are dissolved in hot water, they will give off the fragrance of Ejiao, while the taste of fake Ejiao is fishy.

Extended data:

Preservation of Ejiao Guyuan ointment;

1, just put it in the refrigerator, you can take it out at any time, or you can cut it into small pieces and put it in a container and put it in the refrigerator without freezing too much. Take it out when eating, and you can eat it at room temperature for a while, usually as a snack or snack.

2, in order to facilitate long-term preservation, you can take another bag and seal it (the bag you eat first is best packed in bottles, cans and beverage bottles, with a threaded lid, so that you can tighten the lid and seal it after eating, or you can go to the store to buy a multi-purpose can that is freeze-resistant and microwave-resistant), and the others are best sealed and refrigerated (both fresh-keeping and freezing are acceptable, depending on the time you intend to save, and can be frozen for a long time).

Because Guyuan ointment is stained with saliva or often exposed to the air, it is easy to deteriorate.