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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.
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It does work but not as I expected.
By Simple Simon
At first, I thought this was as simple and clever as a pencil; write with one end, erase with the other. But no: This is for erasing and then over-writing something written in 'royal blue ink' with a fountain pen. This it does pretty well.
Amazing but slightly unfortunate that doesn't erase black well but wold definitely recommend