I recently purchased a Namiki Falcon with a F nib which I really, really, like (I migrated from using Rotring Technical pens 0.25). I suspect the pen shop, where I purchased the pen, sold me their most expensive black ink: OMAS. This being my very first nice fountain pen and possessing unimaginable ignorance on all this stuff, my technical observation is that "hey, this is a nice opaque black" especially for the very fine line widths from the Falcon.
So, I'm wondering, does OMAS make their own ink or relabel them from other manufacturers? If so, who? But, more importantly, in relation to other blacks recommended in these threads, are there other blacks that would show any measurable difference in deeper black appearance in fine line widths? Thoughts?