I've been wondering if I ought to be storing my stash in a refrigerator rather than in a relatively cool, dark place around the house. Lot of anecdotes about the right thing to do, of course, but little hard facts.
After a cursory search of the scientific literature, I found one journal article, albeit from 1976. It seems that light is the biggest factor affecting potency, then oxygen. Oxidation can be minimized by not overhandling and damaging the resin glands, within which the good stuff is contained and protected. Room temperature has an insignificant effect on potency.
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The stability of cannabis and its preparations on storage
Journal of Pharmacy and Pharmacology
Volume 28, Issue 1, pages 1–7, January 1976
http://www.ncbi.nlm.nih.gov/pubmed/6643
Abstract:
Solutions of pure cannabinoids, nine samples of herbal and two of resin cannabis (one freshly prepared) were stored in varying conditions for up to 2 years. Exposure to light (not direct sunlight) was shown to be the greatest single factor in loss of cannabinoids especially in solutions, which should therefore be protected from light during analytical and phytochemical operations. Previous claims that solutions in ethanol were stable have not been substantiated. The effect of temperature, up to 20 degrees [Celsius or 68 degrees Fahrenheit], was insignificant but air oxidation did lead to significant losses. These could be reduced if care was taken to minimize damage to the glands which act as “well filled, well closed containers”. Loss of tetrahydrocannabinol after exposure to light does not lead to an increase in cannabinol, but air oxidation in the dark does. It is concluded that carefully prepared herbal or resin cannabis or extracts are reasonably stable for 1 to 2 years if stored in the dark at room temperature.
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