If there would be a price for the ink with the most beautiful, intriguing name, this ink would definitely be nominated. Aurora Borealis by Diamine is a green, 'tealish' ink. The color is saturated, but still modest. Suitable for an office environment (note taking) and of course for any personal correspondence. Both short and long. I have used this ink for one letter, some cards and a day of note taking.
The behavior of Diamine inks is well-known and predictable. Works absolutely fine in any pen. High quality inks that don't feather, have minimal or no show-through, are well lubricated, are wet but with acceptable drying times and heavy, beautiful shading. Even when writing with a Lamy EF nib, shading is clearly visible. The ink is very susceptible to water.
At first glance this reminded me of Iroshizuku's Syo-ro and yes, the colors are close. Aurora Borealis is a little bit more green and saturated. Iroshizuku's other teal, Ku-jaku, is noticeably more blue. Herbin's Vert empire is more like a moss green and Herbin's Emeraude de Chivor is, like Ku-jaku, far more blue, dark and saturated.
To conclude, Aurora Borealis is a very nice, well-behaved, green color with excellent shading. I will most likely finish the bottle. What's wrong with it is that ' nothing is wrong with it'. Aurora Borealis lacks something special, the ink is too much a dime a dozen.