Gentle way to improve Pamor (no chemicals) - Ethnographic Arms & Armour

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Gentle way to improve Pamor (no chemicals)

10th March 2022, 08:01 PM	#12
A. G. Maisey Member Join Date: May 2006 Posts: 7,019	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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