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david-p posted a topic in Inky ThoughtsI have read recommendations on several websites to avoid specific inks in vintage pens. Examples given are those that have pigments, most of the Noodler catalogue, and, curiously enough, Iroshizuku inks. This last surprised me, as they are not at all water-fast; but the writer claimed that they are highly alkaline. Recommended inks are usually Waterman, Parker, etc, whose range of colours is not very exciting. How about Lamy and Diamine? But more to the point, has anyone in our community actually done tests to determine the pH value of currently available inks? (Doing so is obviously not as simple as dipping litmus paper in the ink!) Further, what constituents in what inks make them bad for vintage pens? A scientific study would be very useful, so that I can with a good conscience use colours other than black and blue in my Parker pens, for instance. David