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https://en.wikipedia.org/wiki/Blackboard
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5082488/
https://www.amazon.com/Quartet-Reversible-Chalkboard-Accessory-WTR406-810/dp/B000C1VA92
https://slate.com/human-interest/2014/10/a-history-of-the-blackboard-how-the-blackboard-became-an-effective-and-ubiquitous-teaching-tool.html
https://www.rd.com/article/blackboards-green-not-black/
https://www.google.com.na/patents/US3444579
https://inmyownstyle.com/how-to-draw-like-an-artist-on-a-chalkboard.html
https://www.venusmanufacturing.com/products/markerboards-chalkboards
http://www.madehow.com/Volume-1/Chalk.html
https://www.google.vu/patents/US20080093524