Here, for the purposes of illustration, is my pen with the ink embedded in what I can only refer to as 'voids' or cracks.
Ok, I see that on my OMD Amber too. Until seeing the picture I thought it was just the swirls in the material. It looks like the bulk amber material (probably PMMA?) and the material swirled through it (maybe celluloid?) don't fuse completely leaving a thin void between them into which ink can flow (probably via capilliary action). I actually like the way it looks, using brown inks (MB toffee brown and Noodler's #41) though with the wrong ink colour it might look rather awful.
Nice review of a very nice pen. I have one of these but with the older 18k gold nibs and it's one of my favourite pens. There is a way to get a complete fill without a travelling ink pot (fill as per instructions, point pen nib up, push plunger until there is no more air in the barrel, hold plunger to stop it going back, dip nib back into bottle, press plunger rest of way) but as you said, even at half capacity you've probably got enough ink for at least a couple of days' worth of writing.
I wish to compliment personally for the filling instructions.
Since I have invented the double reservoir i thought was too difficult to explain how to fill completely the pen without a travelling ink pot. The encrease of ink reaches 30/40% and is worth doing it.
Very well also the tip of empty the front reservoir that makes the pen empty and full at the same time, it is useful in travelling conditions like in a back pack.
I have tested it on my racing bike braking at 180 miles taped to the front fork.
I can grant you that decelaration is impressive and shocks too !
No leaks at all.
The double filling technique Yuki describes also works well with the standard (single resevoir?) power filler, though it's easier to execute with either an ink window or demonstrator pen. Speaking of which, the Michaelangelo Grande LE is the only pen I know of with both the single resevoir power filler and an ink window. Did you make any others?
Oh, and taping a pen to your bike fork is an impressive torture test!