Why are my heroin and opium samples are showing deep green colour with Froehde reagent?

09 August 2023 0 7K Report

I am current doing with drug analysis and for my opium and heroin samples, they shows a deep green colour with Froehde reagent? The results are constant with many samples and in fact it should develop a deep purple color. Anyone with drug analysis experience before, I hope to get some advices from you. Thank you in advance

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