How long in the freezer to dry out? Can I use something like Damp rid and put in a giant ziploc bag?Cold Method with Ethanol
Making tincture cold preserves the integrity of cannabinoids. To be potent, this method requires starting material high in cannabinoid content such as flowers or kief made from trim and leaf. The material must be mold free and dry. Drying can be accomplished in the freezer (-4-10 degrees Celsius) or better yet by placing in a liquid proof bag into a dry ice/ethanol ice bath (-70 degrees Celsius). Once water has been removed then the surface area of the starting material requires expansion. This can be accomplished a number of ways but two ways stand out:
Using flowers (bud)- Place dried buds in a coffee grinder and pulse until thoroughly ground but not powdered.
Making kief- Rub dry trim and leaves over a silk screen. Collect the powder the comes through the screen. It should be a very pale green. "Kiefing" is an age old way of extracting trichomes from plant material.
Whether kief or ground bud is used both should kept ice cold for this preparation. Similarly, the ethanol to be used should also be ice cold throughout the process.
Selection of alcohol- ethanol or ethyl alcohol is the form of alcohol that can be used by humans. The proof listed on commercial alcohol refers to the percentage of ethanol that the beverage contains. The proof is twice the percentage, so 80 "proof" means that the mixture contains 40% ethanol. The higher the alcohol content used, the better the extraction will work. Ideally, 200 proof ethanol would be best except that ethanol cannot be distilled to this proof so benzene is used to remove the last vestiges of water. This makes "pure" ethanol poisonous.
Many folks use "Everclear" which stands at 190 proof or 95% ethanol. Everclear has no taste. Apparently, Everclear is not available in all States. A close second choice is 151 proof rum. This is a light amber liquid that is 75% ethanol that has a sweet taste. One of our caregiver writers will use nothing but Korbel brandy because she likes the taste. Others use iced Russian vodka. These "normal" distilled spirits are 40% to 50% ethanol. Some patients find that the higher proofs ethanols like Everclear and 151 rum burn too much under the tongue. If burning is a concern consider a high quality 90-100 proof Vodka.
Cold Extraction and purification- Use at least one ounce of starting material to each pint of ethanol. Place cold powdered kief or ground cannabis flowers together with ethanol in a glass quart-mixing jar. Close the jar tightly and vigorously shake for five minutes then return to the freezer. Continue to agitate the mixture every few hours with refreezing. Continue for a period of two to three days.
Pour the cold mixture through a double thickness of sterile cheesecloth. Save the cheesecloth "ball" for topical uses or use the material to make bud butter once dried. The liquid collected through the cheesecloth should then be filtered twice through a paper coffee filter. Use gloves throughout the process, as it is necessary to squeeze the cheesecloth and coffee filters to facilitate the extraction. Without gloves some of the material will be absorbed on the skin.
If Everclear is used the tincture will be pale green to golden. If 151 rum is used an amber tincture results. Dark green tinctures mean that excess plant material is present. This does not mean that the tincture will not be potent, just taste nasty. When Everclear is used, various flavor extracts may be added (vanilla, raspberry, etc.). Be careful to use only a few drop of flavor extract.