The feed saturation method of filling a fountain pen is something that’s not always the most practical thing, but it is helpful in certain situations. It’s particularly useful if:

  • The ink level in your bottle is too low to fill directly into the pen
  • Your pen is too big to fit your ink bottle opening
  • Want to use ink from a cartridge that doesn’t fit your pen

The video shows the method better than anything else I can type. Have you ever heard of this method before?