Today I had some students draw all over my classroom walls with markers and when I went to go wipe them with a wet paper towel it just smeared a bit. But when I used a wet magic erasers it came right off. What’s the difference and why does the magic work so well compared to paper towel?
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Part of the genius of magic erasers is that as you use them the scratching abrasive degrades to reveal fresh abrasive behind it, and more behind that, etc., until you use up the whole thing. When sandpaper goes dull there’s no “new sand” behind it to take it’s place. Magic eraser stays effective by constantly revealing the next layer of scratchy material over and over again.
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