Blue stamp: healthy boar.

Red seal: healthy female pork.

Differences in meat quality:

Blue Seal: Meat is usually tender.

Red chapter: Meat is generally a little older.

Extended data:

In some areas, stamps distinguish the sex of pigs, that is, stamps are actually related to boars and sows. Those with blue seals are usually boars, and those with red seals are usually sows.

Even if it is divided into sexes, 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. Buying pork in life, buying pork with a round seal, is the most reassuring. There will be relevant information such as the origin of pork, and pork with such a seal.