Nice ink. It flows well. It seemed to feather on rodia paper with my flex pen, which surprised me. So not sure if this ink is good for really wet pens. I would have liked more saturation. Its still early days though, but a nice change from noodlera black.
A practical everyday choice for the office
This ink works great for me in a professional environment. The hue is conservative and appropriate for office work. The Dark Blue is probably closer to what one would expect in a utilitarian document blue, as opposed to the regular blue that De Atramentis offers which is closer to denim in color.
I use mine in a Esterbrook J with a Falcon Fine Flex nib and find that it flows quite nice. I would project that in a wider nib flow might be too much for me. A very smooth and wet ink with no perceptible shading.
I have not had a chance to test waterproof or permanence qualities. Does need a full 4-5 sec to dry beyond smudging.