I thought about it today and I do think black could be a better choice than blue. The only problem and the main reason I didn't want to use it in the first place because the labels are in black and it's possible things might get a bit lost with black coast line and black labels. I don't have access to a scanner so trying to do digital labels won't work.
Right now I'm doing a 1st draft of a map that I've already done but it's getting a significant make over so I will definitely try black ink.