Why does permanent marker erase after retracing it with dry-erase?
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The ink in markers is a combination of a solid and a liquid, because the pigments are always solid without a liquid.
That liquid evaporates after you draw with the marker, which is why it seems wet and can smear sometimes right after you write.
Dry erase markers just add something to the liquid that keeps the ink from attaching really strongly to the whiteboard, but still have the liquid the normal marker has.
So when you draw on a mark made by a marker, you’re reapplying that liquid and then the pigment mixes the added non-stick piece that makes dry erase markers cool.
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