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Black tar can contain a variable percentage of heroin, but despite the name, what makes Black Tar specific as a type is not actually its heroin (diacetylmorphine) content, but rather the greater mixture of lesser acetylated morphine derivatives-predominantly 6-MAM (6-monoacetylmorphine) and 3-MAM (3-monoacetylmorphine). This is caused by the use of the antiquated Wright-Beckett process (c. 1874), which produces a relatively crude and unrefined opiate product but does not require the complex lab equipment, high-purity acetylating chemicals or lengthy reflux steps necessary to produce pure heroin, making it attractive to clandestine drug producers.

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13y ago

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