Source: Computer World
quote: According to the National Drug Intelligence Center, crystal meth is produced using a "washing" technique that involves dissolving powdered d-methamphetamine in a solvent such as acetone or denatured alcohol. The mixture is allowed to evaporate, causing crystals to form around the edge of the container in which it's being mixed. Large crystals form when the solution evaporates at room temperature, and small crystals form when the solution evaporates in a cold environment such as a refrigerator or freezer. The crystals then are collected and dried, typically on a paper towel. The purity of the finished product depends on the amount of washing and the laboratory operator's level of experience. Also known as ice, crystal meth looks like broken glass or shattered ice and is ingested by smoking.