Putting Sumi Ink in a Technical Pen - A Bad Idea?

Описание к видео Putting Sumi Ink in a Technical Pen - A Bad Idea?

Here is a test where I put Sumi ink in a Technical pen (The most common brand is the Rotring isograph, but this one is a Staedtler Mars matic 700). Not designed for it, but it costs so little I couldn't resist.
It seemed to preform quite well ... sometimes...
But do you know of any long term problems this may create?

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