1. First take out the official seal and seal oil for later use, as shown in the figure.

2. Next, take out the fuel tank in the official seal, as shown in the figure below.

3. Then slowly add ink to the ink cartridge, as shown in the figure.

4. After adding oil, let the ink cartridge stand for a few minutes, and the printing oil is fully absorbed, as shown below.

5. After the ink is completely absorbed, box the ink, as shown in the figure.

6. Finally, try the effect and refuel the official seal, as shown below.