Diamine's Classic Green fountain pen ink is a dark olive green.
You might also refer to this green ink color as "Army Green" or even "Ranger Green" if you're into that kind of thing (that kind of thing being, I guess, "existing under the US SOCOM Umbrella in a state of constant readiness"). Yikes, I've been writing ink descriptions for too long...
This is a dye-based (non-permanent, non-waterproof) ink.
