The drug causes short but intense euphoric effects. Purer forms of crack will sink in water or melt at the edges when near a flame (crack vaporizes at 90 ☌, 194 ☏).Ĭrack, which is derived from powdered cocaine, is a rock-like form of cocaine that can be smoked to achieve a high. A crack rock acts as a (see: ), numbing the tongue or mouth only where directly placed. Purer forms of crack resemble a hard brittle plastic, in crystalline form (snaps when broken). Physical and chemical properties In purer forms, crack rocks appear as off-white nuggets with jagged edges, with a slightly higher density than candle wax.
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