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Reload this Page Gentle way to improve Pamor (no chemicals)
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Old 10th March 2022, 09:01 PM   #12
A. G. Maisey
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Join Date: May 2006
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Jean, old fashioned, ie, "old school" blackboard chalk was made from calcium carbonate + some other stuff, but modern chalk appears to be made from gypsum.

http://cameo.mfa.org/wiki/Blackboard_chalk
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