Pilot's Frixion erasable rollerball is a step ahead of the competition thanks to clever ink which turns transparent when subjected to friction. No eraser dust, and the line disappears very cleanly leaving only a faint impression of the erased line. The ideal way to erase is using the built-in eraser, though most hard plastic works OK. In fact if you're working on newsprint (eg. crosswords and Sudoku), the cap-end works better than the eraser as the eraser will smear the newspaper ink.
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