There have been a number of reviews of the Sailor Nagasawa Kobe line of inks, most recently by visvamitra showcasing the whole line.
Starting with #1
And his review of #3
The usual test papers: MvL=Mohawk via Linen, Hij=Hammermill 28lb inkjet, TR=Tomoe River.
Unfortunately the iPhone seems to not understand dark brown, and always thinks "black". It is so wrong. I've fiddled with the settings to no avail.
Anyway, this is a wonderful, yummy ink.
Surprisingly with some water resistance.
And as always with Sailor custom inks, a very interesting chromatography.