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100% pure MDMA hydrochloride is a white powder or translucent crystal, but impurities are often deliberately left in because it's easy for a street dealer to find a white powder to substitute another white powder with. In contrast, one of the most common impurities is brown with a distinctive odor.
Because of rules set by the US DEA, EcstasyData is not allowed to provide quantitative results for samples it analyzes, which includes reporting on inactive impurities, cuts, or fillers even if they might be present.