My question comes out of my experience with an Esterbrook 9550 nib in a JS pen but could just as easily apply to any of the rest of my pens because all of them do it to some extent, just some worse than others. My JS needs a new bladder so I can't feed it that way in order to compare line weights but it appears that a dipped pen produces a heavier line than a fed pen.
My 9550 nib is an irridium tipped nib and is supposed to be a super fine (xf) for "posting" according to the Esterbroo Nib charts but when dipped it writes exactly the same as my medium tipped ROtring Freeway and Sheaffer Fashion fed by their cartridges or converters. Is this normal and if so what does that mean when I test a pen at the pen store by dipping it. Am I really getting an accurate feel for how a tested pen writes? (so far I haven't had the guts to ask to dip a pen to try it out but assuming that I get the guts one day)
My ROtring, Sheaffer and Pentech pens show a similar tendency of heavier than normal line weight when dipped as well but to a lesser degree. I have tried several of my bottles of Private Reserve inks including Ebony Green, Copperburst and Blue Suede with identical conclusions.
Does anyone have any explanations or similar experiences?
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A word of explanation, the copper/ brown is the medium point Freeway and the blue suede/ teal is the xf Esterbrook 9550