Robert Oster Spearmint
Well, I've tried this ink in three different pens, a Medium, a Japanese Fine and a European Fine. It tends to be darker in the wider nibs, but what gets me is the particular shade of green. Can't quite describe it but it really appeals to me. I think there are some blue tones but the green is really intense. It goes on nicely and dries to a great shade. Well behaved and not dry in any of the pens I've used it in. I have three sample vials of this, but will likely order a bottle at some time. It seems to exhibit the same properties as R.O.'s School Blue, they both have a look that seems to have a great impression on me. Great ink, love it.