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Black tar heroin from Mexico shown with a ruler for scale. Black tar heroin is a type of illicit opiate narcotic drug formed from the incomplete acetylation of morphine. Black tar heroin may be sticky like roofing tar or hard like coal. The color may vary from dark brown to black. The color and consistency of black tar heroin result from the crude processing methods used to illicitly manufacture heroin in Mexico. Black tar heroin is most frequently dissolved, diluted, and then injected. The high from black tar usually lasts from four to six hours. Heroin is a highly addictive drug derived from morphine, which is obtained from the opium poppy. It is a "downer" or depressant that affects the brain's pleasure systems and interferes with the brain's ability to perceive pain.
