Blue seal: healthy boar.

Red stamp: healthy female pork.

Differences in meat quality:

Blue Seal: Meat is usually tender.

Red Seal: Meat is usually a little older.

Extended data:

In some areas, stamps distinguish the sex of pigs, that is, stamps are actually related to boars and sows. The blue seal is usually a boar, and the red seal is usually a sow.

Even if the gender is different, when buying pork, as long as you see the seal, it means that it is qualified and edible.

In fact, the unqualified pork was not stamped, but a big X was drawn on it. If you see this kind of pork, it means that this kind of pork can't circulate in the market.

The other is a rectangular stamp, which means you have to fry it into oil before you can sell it. When buying pork in life, you should buy pork with a round seal, which is the most reassuring. There will be relevant information such as the origin of pork on it, and there is such a seal on the pork.