Yes. I posted on this topic at length, many months ago, along with the research papers by Hoffman.
“Epinephrine solution deteriorates rapidly on exposure to air or light, turning pink from oxidation to adrenochrome and brown from the formation of melanin. “
see page 8https://www.accessdata.fda.gov/drugsatfda_docs/label/2012/204200s000lbl.pdf
Synthetic epinephrine turns into melanin when exposed to light/air? What?