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BrewSkiMAGA 1 point ago +1 / -0

3M Patent - which they expired today 4/03/2020:

"1. A process for preparing adrenochrome which comprises oxidizing adrenaline or a salt thereof with a persulfate in an aqueous medium at a pH in the range 4 to 8 in the presence of one or more water-soluble salts of bismuth. "

http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&d=PALL&s1=4501923.PN.