Perhaps from French bleu-jaune, blue-yellow.
Blue from the slightly blue colour + John of unknown origin.
"blue-john." YourDictionary, n.d. Web. 10 November 2018. <https://www.yourdictionary.com/blue-john>.
blue-john. (n.d.). Retrieved November 10th, 2018, from https://www.yourdictionary.com/blue-john
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