Another thanks to John for his review of Diamine Emerald, and his comparison to Diamine Umber. If you're interested in posting your own guest review on Ink Nouveau, just email me! ~Brian Goulet
Diamine Emerald is another somewhat muted green, but warmer than Diamine Umber. I actually saw yellow tones where the shading is light. I tested Emerald on both the Clairefontaine Unplugged Staplebound Duo and G Lalo off-white, using a Pelikan m215 with Binder Italifine nib, which has a 0.9mm cursive italic on the front side and fine round tip on the backside of the nib.
The flow is slightly less lubricated, IMO, than Diamine Umber, but not uncomfortably so.
Below are a couple images of Emerald on the G Lalo paper, which minimizes the color differences between Emerald and Umber.
Diamine Emerald is available in 2ml samples and 80ml bottles from GouletPens.com.