What I Learned from Wikipedia…

Black cocaine, also known as Coca Negra, is a combination of regular cocaine hydrochloride and various chemicals, such as potassium thiocyanate, usually added at 40% admixture. This renders it undetectable to drug sniffing dogs and the regular chemical tests. Since the result is usually black, it is generally smuggled in as toner in fake IBM brand toner cartridges, fingerprint powder, fertilizer or pigment. The potassium thiocyanate substance is separated out after delivery with a solvent such as acetone and discarded.

http://en.wikipedia.org/wiki/Black_cocaine

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