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https://www.insider.com/why-most-blackboards-are-actually-green-and-not-black-2017-11#:~:text=The%20color%20change%20came%20in,likely%20to%20survive%20the%20journey.
https://www.rd.com/article/blackboards-green-not-black/
https://www.mentalfloss.com/article/504699/why-are-so-many-blackboards-green
https://www.quora.com/Why-are-blackboards-actually-green
https://en.wikipedia.org/wiki/Blackboard
https://resilienteducator.com/classroom-resources/the-history-of-the-classroom-blackboard/
https://www.kiwireport.com/why-most-of-the-blackboards-are-green/
http://desciphearth.weebly.com/whygreen-3.html
https://www.whyguides.com/why-is-the-blackboard-green.html
https://www.speeli.com/why-is-blackboard-green/
https://www.whycenter.com/why-is-the-blackboard-green/
https://english.stackexchange.com/q/123500