• N&PD Moderators: Skorpio

cannabis tincture questions

hollywood_cole

Greenlighter
Joined
Nov 16, 2008
Messages
43
a couple weeks ago, i made a tincture by doing the following:
1) take about 4 grams of finely ground bud, spread thin on a pyrex baking dish and leave in the oven at 260 for an hour to decarboxylate the THC.
2) remove bud from oven, place in mason jar, cover in boiling water. close jar, shake, strain off water, repeat. (the idea being to get rid of whatever water soluble things i could, since the cannabinoids aren't water soluble). press out as much water as possible from the plant matter.
3) in the jar, cover the wet plant matter in about 8 oz of slightly warm 99% isopropyl alcohol. shake, drain alcohol into pyrex dish. repeat with the other half of the bottle of alcohol.
4) let the alcohol evaporate. i did this by running a hair dryer above the dish for a little over an hour and then letting the rest evaporate on its own over the next couple days. a few days later, there was a little bit of liquid in the dish, and it didn't smell like alcohol at all, so i assumed it was the 1% water portion of the 99% alcohol, and left it in the oven to evaporate a bit faster (at 260, the lowest temp i can get, for about 20 minutes).
5) scrape up the crude hash paste in the dish. i'm left with something that's very dark brown and about the consistency and stickiness of caramel. it takes up maybe the same volume as one and a half US quarters. i try to redissolve this in 151 proof grain alcohol in a glass dropper bottle. i notice that it actually doesn't go into solution very easily.

so my questions are:
1) i know that this could vary from brand to brand, but assuming all the isopropyl alcohol was evaporated off (which i'm sure it was), is it likely that there's anything left to be worried about? the bottle didn't mention any ingredients besides isopropyl alcohol, and didn't say anything about being denatured, so i'm assuming i'm probably OK. i've done a number of small doses of my grain alcohol tincture over the last week (in drinks or just directly out of the dropper), and noticed no unexpected irritation or anything. i'd guess i was taking about 2 ml at a time, probably 3 or 4 times on any of the evenings i did it.
2) what's the deal with the hash paste not easily dissolving in everclear? i thought cannabinoids in general were easily soluble in ethanol, so i dropped a little ball of the scraped up resin in a little dropper bottle of everclear... and it just kind of sank to the bottom. after letting it sit overnight, i was able to shake the bottle, and watch it break up and dissolve quite a bit, but there are still tens or hundreds of undissolved little bits floating around in the bottle. any idea what this stuff is, and whether there's an easy way to get it to dissolve? if i have to, i could get 99% ethanol, evap off the everclear of my current solution, and redissolve the paste in 99% ethanol. but i was trying to avoid that for convenience's sake (the reason i didn't just use 99% ethanol for the original extraction is because i'd have to get a friend of mine to obtain it for me). for what it's worth, i did notice that when i slowly added 151 proof ethanol in the pyrex dish and worked the hash paste into it with a razor, it seemed to dissolve more readily.

still, what i've got isn't bad. i was hoping i'd get something where i could put a few drops on/under my tongue, and have it be like taking a couple smoked hits of the same stuff. and it's definitely not that strong, but it works, and still comes on faster than normal edibles.

also, the balance of effects is a bit different than any other method of consumption i've tried. it's more subtle and mellow than smoking or eating or vaporizing. there's a bit of the usual psychedelia (though less than with smoking), and definite music appreciation enhancement, but no rush like a huge hit off a joint or bowl... and while there's body buzz, it's also not as prominent/strong as with normal edibles. still, to a large degreee, it fills the craving to get a little stoned. and while it's calm and sedating, it doesn't have that same (almost narcotic) planted-in-one-spot quality that strong indicas do. actually, adding a couple droppers full in a cup of coffee puts me in a nice place for cranking out some code, kind of like when i can pace myself on a small bowl hit or two every half hour or so. i'm not sure whether this is because of the small bit of alcohol in the mixture, or some odd THC/CBD ratio (since i have no idea what portion of the THC was decarboxylated, and what portion may have vaporized off, though i was very careful to keep temperatures well below 300 degrees F throughout, and the wiki page says THC has a boiling point of 315 F). so i'm also wondering if anyone has any theories about that part of things.
 
Last edited:
The reason your tincture is cloudy is because you used crude hash paste and din't filter the resulting product. The stuff in there will just be plant matter and perhaps dust/dirt from the buds you started with. Nothing harmful a the alcohol and cannabinoids will sterilize everything :)
 
well, the isopropyl alcohol that i drained off and kept to evaporate was filtered... i poured it through a coffee filter sitting in a strainer, and squeezed out all the alcohol i could at the end, but never let the plant matter get past the strainer/filter. the isopropanol was green at that point, and not cloudy at all.

is there any significant difference between isopropanol and ethanol when it comes to dissolving cannabinoids?

now that i think about it: when the isopropanol was evaporating off and got to a pretty low level, it seemed like some of the hash oil was falling out of solution (there was an oily film starting to form on the side of the glass dish, and an oily sheen on top of the alcohol). as it seems that the alcohol evaporated at a faster rate than the water, i'm wondering whether the issue is that there wasn't enough alcohol there to dissolve all the oil, or if the problem was that the water was somehow hindering the oil's solubility. sorry if that's a pretty rudimentary question for ADD, i've got no formal chem education. if it's the latter, then maybe redissolving in 99% ethanol is the way to go. i'd also be interested in any readily available (safe to consume, obviously) additives that could aid the dissolving of the oil in the current mixture.

yet another question: as i imagine other people around here have dealt with the products of this sort of extraction before, any tips for dealing with my oil/paste would be welcome. right now i'm using two single edge razors and being careful not to get it on anything at all since it's tough to clean up. i left about a third of my yield undissolved, sitting in the dish (as soon as it became apparent that it wasn't dissolving as easily as i'd like, i wanted to make sure i had some to use for making another go at the re-dissolving part of the process). for instance, just now, for the first time, i put a bit of the paste in my vaporizer, and i can say that it's definitely plenty active. it's just a total bitch to deal with (took me about five minutes to actually get it loaded up). i need to get it into a solution or form that's easy to work with and divide up, but which takes up as little volume as possible. bonus if it's easy to put on top of a bowl or in a joint in addition to being easily orally consumable (since oral consumption was the primary goal of this little project).
 
There are lots of things that are alcohol soluble in cannabis buds, among them chlorophylls, fats, cannabinoids, other (sometimes oxidised) terpenic components, etc. The addition of water would also add a variety of things that wouldn't be alcohol-soluble. It's likely that as you concentrated it, the less soluble stuff simply crystallized out. You may have better luck with a more non-polar solvent extraction, like heptane, hexane or butane, to remove the terpenes and cannabinoids with more electivity, and (perhaps) attempt to recrystallize them. Isopropanol is slightly less polar than ethanol and will dissolve slightly less water-soluble 'gunk'.

You may want to look into making some drying agent out of Epsom salts - magnesium sulphate. Bake it in the oven at 300 for an hour or so, and keep it away from water and (moist)air. When it cools you can add it to your isopropanol and filter/decant after shaking it and it will suck up the 1% water in 99% IPA.

The oil will be sticky as fuck no matter how you extract it. It should flow easier (and stick to more stuff) at warmer temperatures, and behave more like a solid at lower temperatures. The best way to work with it is in solution (10% or so), remembering to rinse your glassware if needed. Just dip some plant matter in it a few times and it will be infused with magic.
 
Just use isopropanol. Dealing with huge masses of (wet) magnesium sulphate in filters is a fucking mess.
Magsulf will soak up 7 molecules of water for every 1 molecule of magsulf, approximately twice its weight.
 
thanks for all the info. i think my plan might be to try and obtain some 100% ethanol, evap the everclear off what i've got, and redissolve. at the end of the day, easy oral consumption was the main goal, so leaving it dissolved in isopropanol isn't really an option.

for the record, the signal to noise ratio seems pretty fucking terrible when it comes to finding genuinely useful info and discussion on the web about making marijuana tincture. i didn't even find out about the decarboxylation thing until my second attempt*, and that seems like the first thing you'd explain. i feel like there should be better knowledge in general circulation when it comes to this process, right? it's surprising to me that more people aren't more interested in this.

*my first try was last year, just left the ground bud sitting in everclear in the freezer for a few weeks, it wasn't very active at all, though i have a suspicion now that i was getting effects from the extracted CBD when i used it while smoking at the same time.
 
You'll never find 100% ethanol without paying through the nose. Ethanol azeotropes (forms a constant-boiling mixture) with water at about 95%.

Isopropanol is safe to consume in small amounts (less than a few ml).
 
In the future save yourself the hassle by skipping some of those steps and follow this technique for a very effective tincture:

1) Bake the finely-ground cannabis in the oven as before to decarboxylate
2) Simmer the baked cannabis in high proof liquor for 10 mins. The ratio of cannabis : liquid can vary, but I like to use 3.5g : ~2oz.
Use the highest proof you can find, but 150+ is recommended. Do the simmering in a container with a lid (or at least a small surface area) so as to minimize the amount of liquid lost to evaporation. I personally use a small mason jar set on top of a steamer rack (to avoid contact between the jar and heated metal) inside a pot of boiling water.
3) strain the cannabis from the liquid with cheese cloth or similar method. be sure to squeeze it and get all the liquid out.
 
1) any opinions on how long to bake the ground cannabis for? i did 1 hr at 260 F, but i feel like maybe i would've benefited from going longer. i'm considering taking the remaining hash paste and giving it another decarboxylation run.

2) what temp are you simmering the alcohol at?

3) will 2 oz of 151 proof liquor really extract all the cannabinoids from 1/8 of bud?
 
well, i guess if the jar is submerged, you're simmering it at 212, huh? so do you close the jar up? is it big enough relative to the volume of alcohol in it that you're not worried about it exploding? or do you let it vent? is there ever a safe ratio of alcohol to empty space at which you can seal the jar?

i have a gas stove, so i'd have to buy a hotplate to do anything with a venting jar.
 
here's the exact recipe:


Process Summary:

1. Chop cannabis very fine (coffee grinder works great)
2. Place in a shallow pan or aluminum foil and bake at 325°F for 5 minutes.
3. Remove from oven and place cannabis in 2 oz of 151 proof rum
4. Simmer in a water bath for 20 minutes. Maintain temperature of the rum/cannabis mixture between 170°F.
5. Strain the mixture and store.
 
thanks for the info everyone. next time i give this a try from scratch, i'll likely try the green dragon method that's been described and linked to (or something like it, probably decarboxylating for longer at a slightly lower temp than 325). for the paste i've got left, i'll likely try running it in the oven for a while longer in case there's further decarboxylation to be had, and then i'll try and get higher proof ethanol to re-dissolve in.
 
Top