When the ink bottle is screwed too tightly, the cover can be opened as follows:

1. Heat the lid slightly, quickly cover it with a hot rag and tighten it.

2. Wear gloves to reduce friction.

3. Screw a rubber ring on the bottle cap.

4, with a knife, scissors and other hard objects, slowly pry open along the edge of the bottle cap to let air in and balance the air pressure in the bottle.