It has been stated that saturated inks damage pens. Here it's also said that saturated inks reduce the life of the sac. What I have not seen is an explanation of what it is that a saturated ink does. I am making an assumption that what is meant by a saturated ink is an ink where the dye is in a saturated solution. So, if a saturated ink somehow damages sacs and pens, what kind of damage is done by any ink? What kind of action is it that damages pen and sac materials.
All I have ever read about this is that saturated inks damage pens. I haven't read a convincing explanation of how this is accomplished, just the assertion that saturated inks damage pens, and now that saturated inks shorten the lifetime of sacs. Is there some chemical action?
I have used manufacturers' inks in Esterbrooks. Noodler's inks in Esterbrooks and some inks that probably fall into the "boutique ink" bucket. Regular Noodler's inks, bulletproof Noodler's inks. No damage has yet manifested itself in these, or in Parker 51s, Montblanc 144s and 146s, Pelikan M400s, and others. I don't see the damage, but I would like somebody who actually knows the score to explain it.
I think you can use any ink marketed for fountain pens in an Esterbrook. I wouldn't use pigmented inks or India inks. I think pigments will clog a feed. India ink should be expected to clog a feed with varnish.
Artists' paints use pigments. Writing inks use dyes.
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