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Backhaus, Peter. “The Japanese traffic light blues: Stop on red, go on what?.” Feb 25, 2013. [Online] Available: https://www.japantimes.co.jp/life/2013/02/25/language/the-japanese-traffic-light-blues-stop-on-red-go-on-what/ Retrieved February 4, 2021.

Brack, Paul. “Egyptian blue: more than just a colour.” Oct 2, 2015. [Online] Available: https://www.chemistryworld.com/features/egyptian-blue-more-than-just-a-colour/9001.article Retrieved February 4, 2021.

Burrows Grad, Laurie. “Why ...