Just merely curious about that... why? When you sign letters, contracts, and the like with blue ink, it's easier to tell which is the original and which is the copy. Just wondering.
not entirely sure, but the older crowd really seems partial to black ink. Lots of middle aged guys asked about the color too.
One guess, blue is hard for the visually impaired to read. Black offers a better contrast and appears darker. And a lot of schools around here never allowed blue ink in the "old days." when I was in school, we still had some sticklers who wouldn't accept anything but black. Now it seems that even purple and green are acceptable though, so who knows.