The things that need to be prepared for printing oil on the seal are: printing oil and official seal. The adding method is as follows:

1. Prepare the official seal to be oiled.

2. Remove the protective cover of the official seal and open it.

3. Gently press the protective sleeve at the lower part of the official seal.

4. Get to the place where you can take out the ink and stop.

5. Slowly take out the device containing ink.

6. Completely remove the ink device.

7. After taking out the ink device, add the ink that matches the official seal.

8. As long as the device filled with printing oil is put back, the printing of the seal is completed.