My thanks to Louisa for the ink sample.
Diamine Evergreen is a surprisingly deep dark green with a slight hint of grey undertone. Shading is really hard to come by in most nib widths. Even in the 1.1mm stub, the shading is really subtle. Diamine Evergreen looks almost black unless you look closely. I’ll say this makes it a good alternative to standard black and blue inks for corporate use.