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Submitter notes that (prior to sending sample): ''Reagent results were: Mandelin: black, Marquis: dark purple, Froehde: dark blue, Mecke: black, Liebermann: black, Simon: no reaction (light grey).''
Aug 16 2022: The unidentified substance could be a chemical closely related to Benzenepropanoic acid, possibly CAS 2082-79-3. A certified reference sample is available for CAS 2082-79-3, and we may be able to re-analyze this sample to learn more about this unidentified substance. Check back for updates.