My thanks to Leigh Reyes for the ink sample.
Diamine Dark Olive is another Philippines market exclusive. It’s a beautiful dark green-yellow ink similar to Sailor Tokia-Matsu and Robert Oster Signature Jade. Diamine Dark Olive shades well going from a pale yellow-green to a dark green, almost black-green. Personally Dark Olive feels significantly drier than Diamine Lapis Blue. This green is in the family of greens that I really enjoy if you, like me, love the dark green-yellow ink family, this is a nice dry ink to add to the collection.