I thought I'd share the photographs here, in case they will be helpful for anyone. Since display calibration and general accuracy of representation varies, the main value of these is comparative between the shades. Though I did try to make the colors appear as I see them in person (at least on my devices). I think Fire& Ice should be slightly more saturated and a tad more green. Turquoise and Eau de Nil should be a bit less saturated, more matte.
Diamine Asa Blue is a slightly turquoise medium blue.
Birmingham Pen Co. Fountain Turquoise is a pale greenish turquoise.
Lamy Petrol is similar to Noodler's Aircorp Blue Black in regular writing: both are quite green blue-blacks. ACBB has no sheen, Petrol has unique rose gold sheen.
Sailor's Yama Dori was a disappointment to me: it's a dark teal-black that's got a kind of matte washed out appearance. Granted it does sheen easily, but I just didn't care for the lackluster base color.
Robert Oster Fire & Ice: ranges from dark blue-teal to very vivid glowing turquoise, depending on the pen used (dry or wet). Sheen is pretty minimal unless you let the ink concentrate sitting in a pen for a few days.
Diamine Eau de Nil: nice muted blue-teal, darker, not too vivid
Robert Oster Tranquility: this is a green-teal
Robert Oster Aqua: more green than Fire & Ice
J. Herbin Emerald of Chivor: similar to Aqua in base color. Sheen and shimmer can be hit or miss, depending on paper and concentration
Organics Studio Walden Pond "Blue" : definitely a misnomer, there is almost nothing blue about it. It's strongly green, though on the bluer green side. Sheens a vivid metallic magenta so easily, it can take over the whole writing. If you use a dip pen with it and low absorbent paper like Clairefontaine or greeting cards, the metallic sheen completely covers up the green-black, and the letters look like you wrote them with a metallic magenta ink.
Edited by Intensity, 03 April 2018 - 03:23.