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How much is their in a pen nib is it entirely made out of it or just plated in it?

Typically, it’s just the tipping material in a fountain pen that needs to be wear resistant, so a very small amount:


Check out these sources for more info on fountain pens and tipping materials: 

( 1 – image source, on fountain pens ) ( 2 – fountain pens ) ( 3 – tipping alloys )

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