![]() Optical measurements at visible and near infrared (NIR) wavelengths are inherently noninvasive, with a potentially high information content. Finally, the collaborative work presented here demonstrates that the accuracy level attained in this work for optical properties of diffusive phantoms is reliable. Furthermore, due to the ready availability, low cost, long-term stability and batch-to-batch reproducibility of these compounds, they provide a unique fundamental tool for the calibration and performance assessment of diffuse optical spectroscopy instrumentation intended to be used in laboratory or clinical environment. Even if in this study we focused on particular batches of India ink and Intralipid, the reference values determined here represent a solid and useful starting point for preparing diffusive liquid phantoms with accurately defined optical properties. By exploiting a suitable statistical model, comprehensive reference values at three NIR wavelengths for the intrinsic absorption coefficient of India ink and the intrinsic reduced scattering coefficient of Intralipid-20% were determined with an uncertainty of about 2% or better, depending on the wavelength considered, and 1%, respectively. Nine research laboratories from six countries adopting different measurement techniques, instrumental set-ups, and data analysis methods determined at their best the optical properties and relative uncertainties of diffusive dilutions prepared with common samples of the two compounds. Is really a sort of watered out POSTER PAINT, pigment based.A multi-center study has been set up to accurately characterize the optical properties of diffusive liquid phantoms based on Intralipid and India ink at near-infrared (NIR) wavelengths. So SOME calligaphy ink is designed for POSTERS, cards, etc and as such Or may wreck or stain the pen very seriously. White ink, forĮxample is obviously pigment based, and doesn't belong in a FP, yet it FP ink should be DYEīased, pigment base is getting into the area of paint. I belive PR Bubble Gum is a pigmentīase, for example, although I am not positive. Yet, some FP ink has been pigmentīased, although its kind of rare. Should be pigment based as that means the color is made of SOLID It is a PIGMENT based ink rather than dye based. Lacquer or shelac based ink, rather than a water based ink. Briefly Higgins ink is USUALLY (not always) a Ok so that was waaaaaaay baaaaaack when,īut yup, I tried em. Hey I tried em all at one time or another That doesn't stop people from using it, and, yes, sometimes, it Waterproof ink and cannot, or at least should not be used in fountain But probably 95% of all Higgins ink made over the years is Higgins has made ink for fountain pens and that should beįine. Since I cannot see the actual ink you are using I cannot give you anĪnswer. > chemical formulation such that it does actual damage? Is it simply too thick for most fountain pens or is the > not working with it which prompted my original message) I just don't I'm not disagreeing (after all its my little pelikano ![]() > In what way is it not suitable for fountain pens? That aside, could you add a bit of detail please. Started on the first stroke, nib smooth as butter till the day I have been using the Higgins Calligraphy Ink uneventfully in Reply to author | Forward | Print | View thread | Show original | Report this message | Find messages by this author ![]() if you put one of those in an FP, you can kiss it goodbye! Edited Jby fenrisfox It's non-waterproof, and should flush out if you don't like it (oh, and because of that property, the Noodler's is way more permanent).īe very, very careful which Higgins ink you get, though - some of them are waterproof, meant only for dip pens. If you want to try the Higgins Fountain Pen India, I say go ahead. if I did more drawing, I might consider keeping an FP filled with Higgins, specifically for drawing I would carry my main pen filled with Noodler's, though. The Noodler's is more runny, easier to clean, and an all-around better writing ink. Why do I say this? The Higgins gives a denser black, and a better, more uniform black fill when drawing. In short, I'd call the Higgins a "drawing ink," and the Noodler's a "writing ink" - although they could both be used for the other purpose, obviously. I am both an artist and a writer - however, I consider myself primarily a writer (when I sit down with a pen, it's well over 10:1 writing-to-drawing). However - it is somewhat messy, and a bit harder to clean from the nib than either Cross cartridge ink, or Noodler's Black. ![]() it does work, and gave me no clogging problems. I've used Higgins Fountain Pen India in my Cross Century II.
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