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http://cameo.mfa.org/wiki/Blackboard_chalk#:~:text=Blackboard%20chalk%20originally%20contained%20Calcium,with%20water%20to%20form%20Gypsum.
http://www.todayifoundout.com/index.php/2015/05/blackboard-chalk-isnt-chalk/
https://en.wikipedia.org/wiki/Blackboard
http://www.madehow.com/Volume-1/Chalk.html
https://gizmodo.com/blackboard-chalk-isn-t-really-chalk-at-all-1701961875
https://epod.usra.edu/blog/2009/10/sidewalk-chalk-and-the-calcium-cycle.html
http://www.historyofpencils.com/writing-instruments-history/blackboard-chalk-and-whiteboard-pen-history-and-future/
https://www.crayola.com/faq/another-topic/does-crayola-chalk-contain-calcium-carbonate/
https://www.ehow.com/facts_7156870_difference-sidewalk-chalk-chalkboard-chalk_.html
https://kids.kiddle.co/Blackboard
https://www.amazon.com/customerpicks/Explore-chalks-for-blackboard/a3a056c677295b0f13a8
https://www.amazon.com/Creativity-Street-1760-Blackboard-Chalk/dp/B000RRYM7I