Why is it that dry erase markers allow permanent markings to come off?
Here's a demonstration.
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2$\begingroup$ It's apparently the non-polar solvent that the dry erase marker contains: en.wikipedia.org/wiki/Permanent_marker#Removal $\endgroup$– jeremyMar 10, 2013 at 21:03
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1 Answer
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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.
