The ink-x can be used to erase washable (royal) blue fountain pen ink from the page. On the reverse end is a permanent blue ink correction tip, which can be used to write over the erased section. Available with fine, medium or broad eraser tip.
Aplustore erasable ink fountain pen 20251 with 10 blue erasable ink cartridges : Office Products
Lamy X 2 Ink Eraser And Blue Overwriter Pen (Fine) : : Office Products
FP beginner not sure if my Broad nib is actually broad : r/fountainpens
Lamy Ink Eraser and Blue Pen (Fine Tip) A - Import It All
SCHNEIDER 6940 Ink Eradicator Corry Pen, Blue Ink Option:3pc / 5pc per Pack
Pelikan Ink Eradicator : Office Products
Lamy Safari White Fountain Pen w/Blue Ink - Fine Nib
Lamy Safari White Fountain Pen w/Blue Ink - Fine Nib
Lamy Ink Eraser And Blue Overwriter Pen (broad) - Import It All
Lamy Safari Fountain Pen - Orange - Fine Nib
rupertarzeian, Fountain pen blog