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  • EADD Moderators: Pissed_and_messed | Shinji Ikari

Newcomers - Cold Water Extraction: Method Do's & Don'ts

Yeah, don't squeeze the filter. At best, you will be forcing unwanted paracetamol through; at worst, you risk bursting the filter and having to start all over again.

Have faith in the tools you're using, and let the filter get on with its job.
 
Thanks for the welcome shambles.

I figured as much. I misunderstood the instructions in the op. I wanted the purer form and it's always good cutting the other crap if you don't need it. At least I was on the right track!

Thanks for the insight.
 
I suppose it depends on which you find less convenient: smashing up the pills or waiting for them to dissolve! :)

Are you talking about leaving the pills at room temperature, or refrigerating them? Obviously if you mean room temperature then it's highly likely that you'll end up with a lot more paracetamol / ibuprofen in your solution. I must say I'm not entirely convinced the pills would be adequately dissolved either way, even with stirring. The pills will turn mushy alright, but that doesn't necessarily mean they're fully dissolved.

Maybe that's just my experience and my method is flawed, but I've used several different approaches to CWEs over (mumble, mumble) eighteen years or so, and I've always found crushing the pills to work best. YMMV, I guess.
 
If you're leaving it in the fridge then it's not a massive problem I guess. As long as they're all in solution at the end.

I used to start with warm water and then stick the whole lot in the fridge till it was near-frozen. They dissolved pretty quickly in the warm water, but these days I just start with cold, as you do.

I might vary things the next time I do a CWE, just for old time's sake, and see how I get on.
 
Other aspect of relevance is the cold bit. Paracetamol doesn't dissolve well in cold water (from memory below 4C but may be memoryfail of course) whilst codeine dissolves just fine. It's the combination of using sufficiently cold water to prevent the majority of the paracetamol from going into solution with physically filtering the undissolved gunk that is important. If you try to do the same thing with warmer water you'll only be filtering filler and binder not paracetamol.
 
At the risk of this brief precis of the essential aspects of CWEs leaving out all the faff turning into the equivalent of "What have the Romans ever done for us?"... small volume is also your friend (alongside the coldness and filtering) cos no matter how cold or how well filtered you will always end up with approximately 1g of paracetamol per 100ml of liquid. Fairly sure the rest is personal preference for the most part but smallest possible volume of actually cold cold water filtered through filtering medium that does as good a job of filtering as your patience and paranoia levels allow for would be the important bits.
 
Chatative said:
According to Mr Blonde, it's 1g per 100ml at room temperature & 0.1-0.5g -per 100ml at 22C.
Click to expand...

I think that mainly shows the difference between UK "room termperature" and Australian "room temperature" if at a mere 22C you at least half the solubility compared with "room temperature" (8o)

The 1g figure gets used a lot but attaching it to accurate temperatures would definitely be more useful. I mainly go by the assumption it's better to overestimate the solubility than underestimate it and keeping your water volume to a minimum is best whether actual solubility is 1g/100ml or 100mg/100ml. Always better to have more info, but for simplicity's sake (assuming most folk don't actually use a thermometer to check temperatures) leaning towards the high end of potential solubility probably ain't such a bad idea given how horridly toxic paracetamol is. Particularly for folks who may use multiple CWEs daily as is the case for some - all adds up so anything to keep it to a minimum has to be a Good Thing really.
 
In a sort of self-absorbed and macabre way, it's nice to see this thread pop back up it's head :)

But GOD the gear I'm getting now is fucking good and the amounts are about 1.5 x bigger than not just a few months ago.
 
Shambles said:
but for simplicity's sake (assuming most folk don't actually use a thermometer to check temperatures) leaning towards the high end of potential solubility probably ain't such a bad idea given how horridly toxic paracetamol is.
Click to expand...

Very true, it's still possible for possible to have more paracetamol coming through if you don't filter it properly. Especially if you are squeezing the liquid out the APAP. That's why I like to do a t-shirt, squeeze & then filter it a second time through a paper coffee filter.

it's not like you really need a thermometer though, if you use cold tap water & put it straight in the fridge for a while, then it's safe to assume it's below 22C.
 
Hello!

This is my first post and I hope I adhere to the BLUA. My question is hopefully a simple one. SWIM got a pack of 100 Codipar capsules. Each capsule contains 15mg Codeine Phosphate and 500mg Paracetamol. As these are capsules, can SWIM just open up each capsule and mix? SWIM guesses that its just a powder in the capsuals? Would this work better than crushed tablets because it is already in powder form?

Many Thanks!
--Tonux
 
Hi Tonux. Welcome to Bluelight, and please forget all that SWIM nonsense. :)

I reckon your powder should be OK to use in a cold water extraction, as long as it's not the effervescent stuff.


While I'm on the subject, having just re-read almost the entire thread, I have two issues. The first is this, in the very first post, which is the one that noobs are gonna read and then go away and carry out without reading the other 14 pages:

monsta said:
6. When most of the Codeine/Water solution has filtered, carefully twist and wrap the top filter around, gently squeezing any excess water from it.

7. When most of the solution has left the filter, you can now squeeze harder to get every last drop out.
Then you can squeeze the second filter (that's wrapped around the pint glass) to get all the Codeine/Water solution you can out.
Click to expand...

Then, for example:

Shambles said:
Your problem is a simple one: you're not supposed to squeeze the filter. If you do you're just undoing all the filtration you've just done.
Click to expand...

I would agree with Shambles that the last thing you would do is to squeeze out the filters after they've done their stuff. The only thing that would achieve is to add cloudy paracetomol to an otherwise clear solution of codeine.

The only time you should be squeezing out the filters is afterwards, if you intend re-filtering that cloudy solution with a fresh set of filters.

My point is: I think that first post should be edited to remove these potentially dodgy (or ambiguous) instructions.


Next up: All this talk of mortar & pestles, and crushing with hammers... has no-one mentioned electric coffee grinders?

CyU6vji.jpg


Only £14.99 from Argos, no doubt cheaper ones are available. Does all the hard work for you. :)
 
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