A wide variety of solvents can be used for extraction, such as chloroform, dichloromethane, petroleum ether, naphtha, benzene, butane, methanol, ethanol, isopropanol, and olive oil. Currently, resinoids are often obtained by extraction with supercritical carbon dioxide. The alcohols extract undesirable water-soluble substances such as chlorophylls and sugars (which can be removed later by washing with water). Non-polar solvents such as benzene, chloroform and petroleum ether will not extract the water-soluble constituents of marijuana or hashish while still producing hash oil. In general, non-polar cannabis extracts taste much better than polar extracts. Alkali washing further improves the odor and taste.
Hash oil is an extracted cannabis product that may utilize any part of the plant. Ideally, the final product will not contain any residual traces of solvents. It is generally thought to be indistinct from traditional hashish according to the 1961 UN Single Convention on Narcotic Drugs (Schedule I and IV) as it is "the separated resin, whether crude or purified, obtained from the cannabis plant".
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