Hash oil

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Closeup image of a drop of hash oil on the end of a needle

Hash oil, also known as hashish oil, bhutan/butane hash/honey oil (BHO), cannabis oil, liquid cannabis, hemp bud oleoresin, is an oleoresin obtained by solvent extraction of marijuana and/or hashish.


The tetrahydrocannabinol (THC) content of hash oil varies tremendously, since the manufacturers use a random assortment of marijuana plants and preparation techniques. Dealers sometimes cut hash oils with other oils.[1][2]

Hash oils seized in the 1970s had a THC contents ranging from 10 to 30%. The oil available on the U.S. West Coast in 1974 averaged about 15% THC.[1] Samples seized across the United States by the Drug Enforcement Administration over an 18-year period (1980-1997) showed that THC content in hashish and hashish oil averaging 12.9% and 17.4%, respectively, did not show an increase over time.[3] The highest THC concentrations measured were 52.9 % in hashish and 47.0 % in hash oil.[4]

The following compounds were found in naphtha extracts of Bedrocan Dutch medical cannabis:[5]


Hash oil is consumed usually by smoking, ingestion, or vaporization. Vaporizing hash oil is also called taking a "dab" or known colloquially as "dabbing", some times referred to as "dap" from the English verb to daub (Dutch dabben, French dauber), "to smear with something adhesive".[6] Dabbing devices include special kinds of water pipes ("oil rigs"), and vaporizers similar in design to electronic cigarettes.


Hash oil is produced by solvent extraction (maceration, infusion or percolation) of marijuana and/or hashish. After filtering and evaporating the solvent, a sticky resinous dark liquid with a strong herbal odor (remarkably different from the peculiar odor of hemp) remains.[1][7]

Fresh, undried plant material is less suited for hash oil production, because much THC and CBD will be present in their carboxylic acid forms (THCA and CBDA), which may not be highly soluble in some solvents.[1] The acids are decarboxylated during drying and heating (smoking). Fresh, undried plant material is best suited for concrete production.

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.[1][5] 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, and will yield a somewhat more potent oil as a result.[1]

One pound of marijuana yields from 1/5 to 1/10 of a pound of hash oil.[7] The oil may retain considerable residual solvent: oil extracted with longer-chain volatile hydrocarbons (such as naphtha) is less viscous (thinner) than oil extracted with short-chain hydrocarbons (such as butane).[5]

Artificial hashish can be made by adding hash oil to blenderized marijuana in a ratio of from 10 to 50% oil, kneading and drying.[1]

Colored impurities from the oil can be removed by adding activated charcoal to about one third to one half the weight or volume of the solvent containing the dissolved oil, mixing well, filtering, and evaporating the solvent.[1] When decolorizing fatty oils, oil retention can be up to 50 wt % on bleaching earths and nearly 100 wt % on activated charcoal.[8]

Most of the solvents employed are flammable, making the extraction process dangerous. Several explosion and fire incidents related to hash oil manufacturing attempts in homes have been reported.[7]


See also[edit]



  1. ^ a b c d e f g h Michael Starks (1993), Marijuana Chemistry: Genetics, Processing, Potency (2nd ed.), Ronin, pp. 111–126, ISBN 9780914171393 
  2. ^ "Cannabis: Overview", World Drug Report (PDF), United Nations Publications, 2014 
  3. ^ Marilyn A. Huestis; Michael L. Smith (2007), "Human Cannabinoid Pharmacokinetics and Interpretation of Cannabinoid Concentrations in Biological Fluids and Tissues", in Mahmoud A. ElSohly, Marijuana and the Cannabinoids, Humana Press, pp. 205–235 
  4. ^ Rudolf Brenneisen (2007), "Chemistry and Analysis of Phytocannabinoids and Other Cannabis Constituents", in Mahmoud A. ElSohly, Marijuana and the Cannabinoids, Humana Press, pp. 17–49 
  5. ^ a b c Luigi L. Romano; Arno Hazekamp (2013), "Cannabis Oil: chemical evaluation of an upcoming cannabis-based medicine" (PDF), Cannabinoids 1 (1): 1–11 
  6. ^ Samuel Johnson (1785), "daub", A Dictionary of the English Language 1 (6th ed.), p. 541 
  7. ^ a b c Alison Hallett (2013-02-20), "Hash Oil is Blowing Up Across the U.S. - Literally", Wired 
  8. ^ Alfred Thomas (2007), "Fats and Fatty Oils", Ullmann's Encyclopedia of Industrial Chemistry (7th ed.), Wiley, p. 31