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This pen is an ink eraser...
This review is from Centropen 2539 Fountain Pen Ink Eraser Pen - 2 mm - Aromatic Ink
, September 27, 2012
This pen is an ink eraser pen. You cannot write with it like any ordinary pen.
It erases royal blue washable ink by Pelikan, Lamy, Montblanc, Parker etc. and
ist doesn't work with Noodler's inks. You erase your mistake and then you use a
blue fineliner to overwrite it. German students love this kind of pen because at
school and for homework it is very helpful.