I got my bottle of Borealis in the mailbox today. I've been looking forward to checking it out. In particular, I'm curious how this ink, a non-bulletproof but purportedly waterproof ink designed to be super-black, compares with both Old Manhattan, a blackety-black bulletproof, and Aurora Black, which is the ink Borealis is supposed to be an improvement on.
As far as blackness is concerned, it soaks up the light real well. It's ever so slightly on the green side, but you won't see that under regular use. Borealis is definitely darker than Aurora, which is a very blacky black in its own right. Compared to Old Manhattan, it's a bit of a closer call. At first glance they look the same, but in the Borealis there's a very slight hint of shading, while the areas I filled with Old Manhattan look completely flat and even; no shading, just blackness.
So far it sounds as though Old Manhattan is the hands-down winner here, but hold on. The difference in blackness is very slight and there are other characteristics to compare. All three inks are pretty well-behaved as far as spidering and feathering goes. Borealis doesn't appear to be feathering at all on my Moleskine paper, and that by itself speaks highly of it.
What I find remarkable in Borealis is that it dries faster than either Aurora or Old Manhattan. Old Manhattan needs 12-15 seconds of sitting to prevent smudging. Aurora is safe to run your finger over it after six seconds. Borealis doesn't smudge after only three. Three seconds! That's a pretty quick dry in my book.
Sorry, no scans, but I'm not really confident in my ability to convey the character of a black ink in a scan.
