Montegrappa
Black, Blue, Turquoise, Green
Despite positive comments on Montegrappa black,
when I bought the Montegrappa Extra fountain pen, in the Parchment colour
(white and semi-transulent), the store steered me away from the ink and suggested
I use Waterman Blue because of possible ink staining of the semi-transulent
body.
That warning concerned me. So, I have not tried any of their inks.
-
Blue - the ink comes in a bottle that is described as being just about as good as an ink well. The blue has good colour and flow. The colour is closer to a blue-black as opposed to the blues that tend to lean to a blue-purple. (thanks - M. Soards)

