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As a kid I have memories of my father, an architect, trying to clean out and get ink to flow from his Rotring Isograph pens. The issue was the need to use a dark permanent ink, traditionally in the UK Indian Ink (known as India Ink in the USA). This would quickly dry in the pen, clogging it. I have no clue if capillary/tube nibbed pens are easier to clean than more traditional fountain pens but it always seemed to be messy and a cause of frustration.
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