Oxidation of opium sap

Oxidation of opium sap is a chemical reaction that takes place when the white sap that seeps out of the poppy seed pod combines with oxygen. As the sap reacts with oxygen it immediately starts to produce melanins, which turns the sap brown. The browning of the sap is called oxidation and oxidized opium sap is called “raw opium.” After raw opium is cleaned and dried it is simply called “opium” or “pure opium.”

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For More Information On Opium Oxidation

See: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1259138/pdf/biochemj01169-0054.pdf