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Blackboard chalk

A medium for writing

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A Quick Tip by Sharrie

  • Jun 29, 2011
  • by
Life is great without it! No more dusting and no more schooling! ;-)

Oops, chalk is found in toothpaste?!!!
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About the reviewer
Sharrie ()
Ranked #3
I'm a traveler at heart & have been nicknamed Travel Queen by friends & colleagues alike. Traveling has been my life passion for the last decade or so. As we enter a new decade, I'm excited … more
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Wiki

Blackboard chalk is a substance used for drawing on rough surfaces, as it readily crumbles leaving particles that stick loosely to these surfaces. Although traditionally composed of natural chalk, modern blackboard chalk is generally made from the mineral gypsum (calcium sulfate), often supplied in sticks of compressed powder about 4 in (10 cm) long.
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