Fixing scanned Ink Lines

[Hydro]

Thanks for the responses. I ended up restarting from the same initial scanned image. I first maximized the contrast and then applied the erode filter several times. The end result was line-work without the white spots, but now there are unwanted black spots (see attached). I think these are unwanted markings from the original scan that have been enhanced. Is there a way I can prevent/remove these with GIMP?