Pigments for pork seals are all usable pigments.

Pork stamps have three colors, which respectively represent the following meanings:

1, red: the red seal represents the sow, which is round, with the words "veterinary inspection" horizontally arranged in the middle and marked with the year, month and day;

2. Blue: The blue seal represents wild boar. There are many blue stamps in the market, which are round, with the words "animal inspection" in the middle and marked with the year, month and day;

3. Purple: From the point of view of protecting consumers, it is strictly forbidden for all slaughterhouses to slaughter livestock privately. All pork must be checked and accepted by the State Inspection and Quarantine Bureau before being sold to the market, and then a purple seal is affixed, indicating that it is non-toxic and safe to eat.