Dark enough without being black
I hesitated before getting a sample of P.W. Akkerman Dutch Masters #11 Vermeer’s Kobaltblauw because of the green tinge it was reported having in reviews I saw. I’m glad I bought one. It’s similar to Röhrer and Klingner Verdigris, but less watery. It is also less watery than both Robert Oster Blue Night and Midnight Sapphire. It’s greener than Kaweco Midnight Blue and very different from Waterman Mysterious Blue, which is lighter, less saturated and livelier. Kobaltblauw coats the nib well and my driest nibs did well with it. I found subtle red sheen around the edges where the ink pools in heavily saturated areas, which is not obtrusive in normal writing, even with wetter nibs. I found it to take a bit longer to dry than Waterman inks, especially on less absorbent papers. It flows well and I can achieve crisp lines with my Sailor 1911L 21 kt H-B nib. Reading back pages and pages of notes is not a problem. Because it is a dark colour, I would avoid it while proofreading or corrections on office paper because it lacks contrast with black text. I find it’s a great colour for the workplace: dark enough without being black.