Supernatural is a bright Kelly green.
In large swabs there is some interesting shading. The ink drops took forever to dry, and haven't even dried yet, they are still a bit wet.
Let's take a look at how the ink behaves on fountain pen friendly papers: Rhodia, Tomoe River, and Leuchtturm.
Dry time: 30 seconds
Water resistance: Low
Show through: Medium
On Staples 24 lb copy paper there was feathering and just a little bit of bleeding.
Overall, it's got some nice shading, but it's pretty close to Diamine Kelly Green, which is much cheaper, and has a slightly better flow.
Disclaimer: A sample of this ink was provided by Pen Chalet for the purpose of this review. All photos and opinions are my own. This page does contain affiliate links, but is not sponsored in any way.