So, I noticed something odd the other day. I was writing in a notebook using my Asvine V126 with Diamine Writer’s Blood. When I came home I grabbed by V200 with Writer’s Blood to finish what I was writing, but the color / shading of the ink was very different. It was a lot darker and more saturated from the V200 vs the V126.

I compared the nibs under my loupe, but they seem to be mostly the same (ie, tines about the same width, no mis-alignment, etc.)

So, I decided to take things a step further and made the image in this message. Note both the Diamine Aurora Borealis and Writer’s Blood seem to have quite different characteristics.

(I should mention: all pens were recently cleaned, and all filled at the same time from the same bottle(s) of ink…)

Anyone have any thoughts on why this would be the case?
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@unattributed

Feed on V200 has a wetter ink flow than the feed on V126.

@backtoanalog That would make sense if there were a difference in the feeds - but these pens use the same feed / nib. (#6 Asvine feed / nib.)

Someone else suggested swapping the feed / nib between the pens. That makes sense to me, if I see the V126 feed/nib performing the same in a V200 then it's specific to that nib/feed.

@unattributed Different feeds maybe? The feed in the v200 may be letting through more ink.

I think the nibs in those are the same size (#6 IIRC) so the feed is about the only thing left. They are usually both plastic, though.

You could try swapping the nibs and or feeds to see which makes the difference.

@jimp I should be able to swap the whole assembly now that you mention it... That seems like a good idea.

@unattributed
That's a nice comparison sheet. It brings to mind the holy trinity of the writing experience; pen, ink, and paper. Change any of the 3 and get a different experience.

Sometimes the cause of any difference is evident and sometimes not. Did you notice a difference in wetness while writing?

@tallastro No, that's one of the reasons I'm surprised. As someone else mentions, these are #6 nibs in both models, and they are all Fine nibs. The feel is literally the same with all the pens (big reason that I like them - one set is easier to carry around, but the feeling is the same no matter which one I'm using).
@unattributed
May be the ink flow is different for some reason?
A slight gap of a tenth of a millimeter in the feed channel can cause more ink to reach the nib. More ink on the paper takes longer to dry and leaves a less transparent, darker stain.
@rpla I'll look again, but my first examination under the loupe really didn't give me the impression that there was a difference in the tine gap at all.
@rpla Thinking about this some more - if I can't see the difference, maybe I'll have to break out the feeler gauges to see if there is a difference that isn't visible to me...