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Why is it that dry erase markers allow permanent markings to come off?

Here's a demonstration.

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The solvent of the marker dissolves the permanent ink and mixes it with the whiteboard ink, leaving a dark dust that doesn't stick to the board.

The link in Wikipedia doesn't name common ethyl alcohol (denatured or not) as being a solvent for old marks. That is what I have used.

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protected by orthocresol Apr 21 '17 at 20:26

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