I'm a long-time user of Cabon and other pigmented inks in my fountain pens. I
keep Platinum Carbon in my Pilot Vanishing Point (F), which is my daily-carry
pen, as well as my Pelikan Souverän M1000 and Omas Ogiva fountain pens. The
Pelikan and Omas have customized extra-fine nibs and optimized feeds for those
nibs, but Carbon flows just as freely through them as any Noodler's, Omas,
Iroshizuku, or Pelikan inks I've used in them. I've had Carbon sit idly in my
Omas for weeks at a time and had no hard starts nor feeding issues with it.
Bear in mind that I'm rather meticulous (feel free to call me anal retentive if
you want) when it comes to cleaning my pens: I flush with cool, clean water
until it runs mostly clear; flush with a mild amonia solution two or three
times; soak the entire nib and feed section (yes, I disassemble my expensive,
piston-fill pens too) in the same kind of mild amonia solution overnight; flush
three or four times with cool, fresh water; leave nib and section to dry
Using that procedure, I've never had flow nor clogging issues.
In terms of the properties of this particular ink, it is quite completely
waterproof AFTER IT'S HAD A CHANCE TO DRY FULLY. If you're going to be going
over the lines with a wash or markers, I'd strongly suggest giving it a full
hour to dry even though if you've only done line work with Carbon it ought to be
dry enough after five or so minutes (tops).
The color is rich and dark enough, depending on how "dry" or "wet" your feed is.
This is not an ink intended for use with dip pens (although I've used it with
pointed pens after mixing in some gum arabic with excellent results). I will say
that with my drier pens, the color isn't quite as saturated as a few of
Noodler's blacks, but to my eye it seems at least as dark as Noodler's most
popular "Bulletproof" black; and without the smell of his "Bulletproof" inks!
As I mentioned before, I always keep my daily-carry pen filled with this Carbon
ink and plan on continuing to do so until Platinum stops making it, which I hope
never happens in my lifetime.
HTH & YMMV
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