So I see that your freezer has to be able to make your ice cream HARD and if it can't then its no good. Well my freezer sucks and yet I still got a great yield using Freeze Percip.

SO...

Go to McDonalds or your local gas station and buy a bag of ice.

OR just make 3-4 Ice Cube Trays up.

grab 5-10 zip lock bags (less if you only have a jar or two and more if you have a lot of jars)

put a handful of ice or 6-7 ice cubs in each bag and ziplock the bag (taking the air out first)

You want to make sure the ice isn't stuffed in the bag because you want it to lay flat when you put it in the freezer.

Now that you have lots of bags with ice in it. Put your jars in the freezer and COVER the jars completely with ice bags.

I've even thought about buying one of those foam coolers and putting a layer of ice on the bottom and then jars (leaving room around the edge to fill up with more ice then a layer of ice on top then the lid. THEN in the freezer it goes.

Doing this got me over 1.5% yield on 100grams of bark in a junk freezer.

Have you tried with dry ice? I have no idea if it would work better or not but it's a thought I've been entertaining.

Yeah I thought about it as I was filling the zip lock bags.

I think It depends on at what temp Naphtha freeze's if it freeze's at all. If it doesn't then I think it would work great.

Try it out on your next extract. I'm good with spice for a while now

next time I will give a whirl if you haven't done it already.

I would try it 3 ways.

1) I would buy a foam cooler put a couple pieces of dry ice down to sit the jars on then pack the dry ice around it.

2) buy 1 large cooler and 1 cooler about half the size. put jars in smaller cooler and lower in the middle of the large one. put dry ice in the large cooler surrounding the smaller one. put lids on both cooler (I'm thinking that dry ice may be a little extreme on the jars and if so then a layer of separation could prove helpful

3) simply wrap 4-5 pages of news paper or paper towel around the jar (again for layer of separation; if number 2 proves not to get cold enough)

I have these ice-pack things that work good for this... I believe the liquid freezes colder than water but I dunno. A bag with ice would actually probably work better though.

My freezer is the kind that releases a large plume of frosty vapor every time the door is open. so freeze precip is good anyway

I don't understand how this would make a difference; I mean if the ice was made in the same freezer then it is the same temperature and therefore will not cool the solvent any further.

You can also evaporate your solvent enough before precipitation to be able to form your product in a fridge.

Yup. I've used warm naphtha and a hot bath and had crystals start crashing out at room temp after pulling. Saturation is indeed key.

i had a question regarding evaporation. what is the difference in fan evaporating the whole dish of naphtha to crystal, as opposed to freeze preip? i think i read that freeze precip makes cleaner crystals but i may be mistaken.

for my next extraction, i wanted to fan evap almost all my naphtha, to the point where i start seeing some crystals crashing out, then stop the fan evap and freeze precip it. my goal is to form as many crystals as possible through free precip, while trying to fan evap and precip as much naphtha as i can be rid of.

When evaporating, everything that is dissolved in the naphtha will end up in the final product. When freeze precipitating many impurities remain in the naphtha. Hence freeze precipitation yields a cleaner product. The yield of freeze precipitation depends positively on the concentration of DMT, so it's smart indeed to let it evaporate until crystals start to form, and then freeze precipitate.

wait..you can buy a bag of ice at mcdonalds?

If you wrap the jars in aluminum foil, you can even precipitate in the fridge. Cuts freezer time by about a third.

pyrex dishes work much better because there is more surface area for the naphtha to get colder quicker... Also my Gnome learned that when he placed the dish on top of a flat, frozen package of bacon, it seemed to help too! You could also add a small amount of water to a large zip-lock bag and place it on its side to freeze...Then place it under the pyrex dish.

I used dry ice in a small ice chest for my first extraction, worked like a charm. :0

you could also try an ice bath with a lot of salt, To lower the freezing point. you could easily get temperatures -15 to -18 C

a chunk of dry ice in a cooler = snowstorm in 20 mins

easy as can be

I had my solvent in a jar within a ziplock full of ice, water and salt. After an hour or so the jar becomes surrounded by a very cold, dense slush. The DMT condenses at the bottom very well this way. If you can make your freezer colder I suppose it'd help but at a certain point I don't see it affecting much other than the time it takes for the DMT to condense.

YEP!