How to stop a pen from leaking at the bottom when writing ?

There are a few things you can try to prevent a pen from leaking at the bottom when writing:

1. Store the pen upright: When not in use, store the pen upright with the tip facing up. This can help prevent the ink from pooling at the bottom of the pen and leaking out.

2. Use the pen on a flat surface: When writing, try to keep the pen on a flat surface to prevent the ink from flowing too quickly and leaking out.

3. Do not shake the pen: Avoid shaking the pen vigorously before using it, as this can cause the ink to leak out of the bottom.

4. Replace the pen cartridge: If the pen continues to leak, it may be time to replace the cartridge or refill the ink. Using a fresh cartridge can help prevent leaks.

5. Use a different pen: If the problem persists, consider using a different type of pen that is less prone to leaking. Gel pens, for example, are known for their smooth writing but can be more prone to leaking. Consider using a ballpoint pen instead.