The difference between a red seal and a blue seal on a pig.

I think the difference between a red seal and a blue seal on a pig is that:

The red seal is made of red inkpad, representing pork that meets the standard of commercial pig; The blue seal is made of blue inkpad, which represents pork that does not meet the standard of commercial pigs. Before the raw pork of designated slaughter enterprises goes on the market, the animal quarantine station shall affix the blue rolling quarantine seal, and the designated slaughter enterprises shall affix the blue-purple meat quality inspection seal.