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What kind of board chalk is this?

  1. Jun 8, 2012 #1
  2. jcsd
  3. Jun 8, 2012 #2

    Pythagorean

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  4. Jun 8, 2012 #3
    Thanks for the suggestion. I have to erase a board probably 10 times a lecture, so wiping it down with water will not work well for me.
     
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