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Ti riporto un analisi al laboratorio di una pillola di yaba:
Impurity profiles of methamphetamine tablets seized in Thailand have been investigated. The samples are extracted with small amounts of ethyl acetate under alkaline condition and the extracts are analyzed by capillary gas chromatography. Nine compounds (1,2-dimethyl-3-phenylaziridine, ephedrine, methylephedrine, N-formylmethamphetamine, N-acetylmethamphetamine, N-formylephedrine, N-acetylephedrine, N,O-diacetylephedrie, methamphetamine dimer) are identified as impurities in methamphetamine tablet. Caffeine and ethyl vanillin are also detected as diluents and/or adulterants, and acetylcodeine monoacetylmorphine and diacetylmorphine are contained in many samples.
In poche parole sono pillole di colore rosso (ma anche arancione e verde) di metanfetamina tagliate con stimolanti (anfetamine, caffeina, efedrina..) e in molti casi anche eroina.
Sono molto diffuse in asia, sono economiche (vengono prodotte con sostanze di scarto) ed in genere vengono fumate.