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Thread: Co2 Dry Ice Cure (freezer Drying) All U Need To Know!

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    Co2 Dry Ice Cure (freezer Drying) All U Need To Know!

    DRY ICE CURE (FREEZER DRYING) ALL U NEED TO KNOW!!
    - What is Dry Ice? "Dry Ice" is frozen Carbon Dioxide. CO2 will change from its solid, frozen state to its gaseous state without passing through a liquid state - hence it’s name ‘dry ice’. This process of solid changing to gas is known as sublimation. What is Sublimation? Sublimation is a simple process which depends on the fact that the surface of a frozen solid is actually quite active at the molecular level. In the case of water ice, water molecules are constantly leaving and binding to the frozen surface. In a moist atmosphere, more water molecules bind to the surface than leave, and ice grows on the surface (e.g frost inside your freezer). In a dry atmosphere however, more water molecules leave the frozen surface than adhere, so the solid dries out. The same process occurs with Dry Ice. As there is a fairly low CO2 content in air, the dry ice sublimes away completely, leaving no residue or liquid - hence its name. What is Freeze Drying? Freeze drying (scientific name: Lyophilization) depends upon the process of sublimation (explained below), and on the fact that like CO2, frozen water at low temperature will go through the process of sublimation under the right conditions. Dry ice has a very low water content, as it is made up of almost pure CO2. In theory it IS pure, but even from a lab suppliers, it will have a small amount of impurities - these do not matter for our purposes. In effect the dry ice vapour has near zero relative humidity. Now: (this is the important bit) When material containing water is placed into this almost zero humidity environment, the water molecules are drawn out of the material and into the CO2, raising the relative humidity of the CO2 and lowering the water content of the material. If the CO2 around the material is steadily replenished then the process will continue until all moisture has been removed from the material. All this happens at low temperatures, below the freezing point of water, which means that the material is preserved in a totally ‘fresh’ state. How Do I Freeze Dry Grass? Use a container (I use a Tupperware box) that is twice as big as the volume of grass you wish to dry. Make a few small holes in the lid, to allow the gas to escape. Put equal volumes of bud and dry ice inside, loosely packed, with the dry ice underneath the bud. Put the lid on and make sure it is properly sealed so that the only way for gas to escape is through the holes in the lid. Put the box into a freezer, lid upwards. This is to keep the material as cold as possible, prolonging the sublimation process for as long as possible. The dry ice will begin to sublime pushing all air out of the box and surrounding your buds with bone dry co2. The totally dry atmosphere will begin drawing water molecules out of the plant material. Check the tub after 24 hours and then every 24 hours until the dry ice has all gone. When the ice is all gone -the buds should be completely dry and smokeable. If you find that they are not quite dry then put some more dry ice into the box, place the lot back in the freezer and wait until they are done. Can I use a fridge? You could use a fridge instead of a freezer, but the dry ice would evaporate very quickly so you'd need a lot more of it to dry the buds, hence the expense would rise rapidly. Better would be to use a ‘cool box’ - one of the plastic insulated boxes for food storage when camping. Again - make sure that there are holes so that the gas can escape. Do I need to prepare the buds? It's better to partially dry the buds so that they are nearly dry, then finish them off with dry ice. If you use fresh, wet grass then you can expect the process to take much longer and to use more dry ice, pushing the cost up. I find that using partially dry buds in a freezer the dry ice has gone after about 48 hrs. What I do is give them a week of slow dry, then manicure, THEN freeze dry them. What are the advantages? The advantages of this method are increased potency and a 'fresher' taste. As the material is preserved in a totally ‘fresh’ state, the THC glands suffer as little degredation from heat, light and air as is possible. No other drying process preserves the resin glands is such a fresh state as can be achieved with freeze drying. Why should I freeze dry? Freeze drying is good if you plan to freeze your bud anyway. If you don't want to keep it in the freezer then there isn't a lot to be gained by using the technique, as the 'fresh' thc will rapidly degrade as usual once outside the freezer. Where Can I get Dry Ice? You can get dry ice from most lab suppliers (expensive) but many industrial ice houses or ice cream suppliers sell it for considerably less (preferred option) Just try the yellow pages. My Opinion Based on Experience To be honest, In my experience the dry ice cure is a lot of trouble for little benefit, as the final taste isn't as good as you can get by slow drying and glass jar curing. Generally it's greener tasting and somewhat 'minty' due to the remaining chlorophyll. Strangely enough, some people like this minty taste and associate it with strength. (weird, I know - but they do.) Does it really increase potency? I have tried comparison by using a control sample, and freeze drying definitely seems to give you a slightly ‘higher’ hit with a ‘mintier’ taste than the jar cure, but the overall strength didn't seem hugely different. It's a connoisseur smoke, perhaps. In a blind test at a party with about thirty people involved it came out about evenly split as to which was the strongest, but that was a subjective test, and was only conducted in a very stoned manner! According to The Frank & Rosenthal Guide, anecdotal evidence suggests that freezing improves potency, which is why I got into the process in the first place. I'm not convinced either way, but it was a fun technique to play with for a while.

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    420 Member FishSticks's Avatar
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    Re: Co2 Dry Ice Cure (freezer Drying) All U Need To Know!!

    wow thank you MOOSE!!

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    Re: Co2 Dry Ice Cure (freezer Drying) All U Need To Know!!

    I tried this years ago. Got the method from a Mel Frank book. Ended up with freeze dried cannabis that was too dry to try and smoke. Had to "rehydrate" it. No potency difference noticed.
    Did anyone notice the statement in the article that this method is only good if you "plan on keeping the bud in the freezer"? And that if you don't nothing will be gained by using the process? Seems like a big waste of time to me. But then again...just my opinion.

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    Re: Co2 Dry Ice Cure (freezer Drying) All U Need To Know!!

    Waste of time and money.

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    420 Member grandma's Avatar
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    Re: Co2 Dry Ice Cure (freezer Drying) All U Need To Know!!

    Curing is an art. It can take up to six months to cure pot properly, and this dry ice method can get close to six-month cured pot inside of two weeks!

    Only for the connoisseurs, and science buffs.
    Rating: Very Cool. 4/5
    TheBigOlBear thanked you for this post
     

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    Re: Co2 Dry Ice Cure (freezer Drying) All U Need To Know!!

    Last edited by Medical Marijuana; 06-15-2008 at 12:52 AM.

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    Re: Co2 Dry Ice Cure (freezer Drying) All U Need To Know!!

    dude ive heard of bid done this way and what I heard was that the chlorophyll doesn't leach out and you get a green taste and harsh smoke! Nothing could possibly beat the hang dry, jar cure method NOTHING!

    I don't think its a good idea to try and speed things up at the last minute after you've spent all that time, money, effort and love into growing them for the past few months just be patient and wait atlest 3 weeks after harvest ( 7 to 10 day dry, and two weeks of jar curing) I don't think you could get quality smoke any sooner then that.

    I plan on eventually, after my harvest becomes perpetual only selling or smoking buds that have cured atleast 6 months.
    nothing beats the fllavors or the smoothness or the way it burns ooh damn! My mouth is watering! Ima go smoke some widow!

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    Re: Co2 Dry Ice Cure (freezer Drying) All U Need To Know!!

    I always freeze my bud overnight in the freezer before hanging to dry like normal. The slow freeze will create ice crystals that will puncture cell walls and cause the liquid inside to escape. Saw on a cooking show how they used dry ice to quick freeze fruit to avoid that. Gave it a shot with some bud to good effect. Bud dries completely in less than a week and tastes like strong citrus. No grassy taste. Still nice and sticky too.

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    Re: Co2 Dry Ice Cure (freezer Drying) All U Need To Know!!

    I wouldn't recommend messing around with dry ice. I saw a guy seal a block into a plastic ice chest. about 10 minutes later it exploded due to a build up of gasses. literally exploded into pieces. When it comes to curing... long, slow and low are the words. Long dry with a slow cure all at low temps. Countless years of doing it this way has produced proven results for tons of growers.