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A/B vs STB Comparison (pics) + FINAL TALLY!

Migrated topic.
had to put in my 2 cents

i use stb with xylene or dlimo - fasa or fasi
i never get less than 2% freebase after the first 3 pulls and stop after 4-5 pulls and 2.4% or so - sometimes u get lucky and get more.

a/b with mhrb for me is just a hassle and the end result after heptane cleanup is about the same - just more work and more time/dirty pots.
 
booldmt said:
Just a quick fyi jbark re: Naphtha

There is another solvent option for Canadians - Recochem Camping Fuel

You can find it at Acklands

I don't think there is an Aklands in Quebec, but i'll keep my eyes open for it next time i am in Ontario. Thanks for the tip!

JBArk
 
Trickster said:
For a number of reasons I do not think your results should be considered as a basis for general conclusions. That's what 69ron was saying.

E.g. when I was experimenting with STB, several times my yield was ~2% (1.5% after re-xing). I did not run an A/B on that batch but I doubt I could have gotten 4% yield with any tek.

Also most people agree that an essential part of an A/B is filtering and discarding solids after the "A" stage. So, Panoramix's tek is sort of enchanced STB, rather than a proper A/B. Therefore we can only talk about comparing these two teks (Panoramix's and STB).

For any far reaching conclusions your result should be repeatable by anybody anywhere under the same conditions. Otherwise they could be experimenter-specific. Only if you run a few dozen Panoramix's and STB extractions and average your results you can generalize.

Trickster - I am fielding information and sharing my experiences. There is clearly not enough information or repetition to base any solid conclusions on (nor is performing these teks dozens of times practical), nor was I proposing that this was the end of the line and the final word on comparing these two teks. I guess I assume anyone with a head on their shoulders would understand this, so i didn't see the need to spell it out.

Insofar as your high STB yield goes, am I to assume it was Gir's tek you used? if not, it's not a fair comparison, nor is it one if you didn't use the same bark that i used for my comparison (I assumed this also, would be obvious).

I really am having trouble understanding your attitude toward this thread. Should we not be encouraging this sort of experimentation? And encouraging sound method and applauding others efforts? You seem to have a real problem with what's been done here, and are prone to hyperbole to support your points - where do you get that "most people agree that an essential part of an A/B is filtering and discarding solids after the "A" stage"? There seemed to have in actuality been as much contention as agreement when that point was brought up in this thread, and do I need to point out again that this definition is present NOWHERE ON THIS SITE? I have been clear about addressing yours and others concerns in the thread and in the conclusion, but until an A/B is defined the way you define it, I have no other alternative than to rely on its placement in the A/B tek section in the wiki. What is so difficult to understand about this? You brought up a valid but contentious point, and I addressed it and added caveats all through the process, even adding quotation marks around all subsequent references to the "A/B" tek...

You have access to the wiki - change the definition yourself, and if it is accepted, we'll take panoramix tek out of the A/B section and create a subcategory. And i will rename this thread appropriately. But I will not take it on your sole authority.

"For any far reaching conclusions your result should be repeatable by anybody anywhere under the same conditions. Otherwise they could be experimenter-specific. Only if you run a few dozen Panoramix's and STB extractions and average your results you can generalize."

I never claimed "far-reaching conclusions", nor were they implied (there's the hyperbole again). Insofar as being "repeatable by anybody anywhere under the same conditions", we are on an internet forum!! Even if you order bark from my vendor, there are no assurances that it will be the same bark, so from the get-go no one can create the "same conditions". Do I really need to spell this out? I took it for granted that no one would be using this thread as the last word in A/B vs STB comparison, or even the last word on the comparison of these two teks!

All experiments, btw, by ANYONE on this forum are "experimenter-specific", so your pointing it out in this case kinda seems a little condescending and mean spirited. I can only assume you side with Ron69 and assert, in my words, either or all:

"A - that tek comparisons are pointless
B - that no lab processes or tests are valid
C - that MY method is suspect

By default it must be one of these, or why post at all? We are all aware of the fallibility of the process, but from there to a conclusion that processes are pointless is too large a leap for me. I guess for anyone out there who agrees with Ron, the only solution is to ignore this thread and do your own comparisons!! I personally would like to encourage everyone to do similar side by sides, for reasons stated above."

So where does this leave us? Rather counterproductive and short sighted stance IMO, if your goal is to discourage experimentation on this forum. If not, then why not do what everyone else seems to be doing, and take this thread for what it is: one person's sharing of their time and experience to try and enrich and further the knowledge base on the nexus by encouraging further experimentation?

I really don't know what else to say, other than this is all rather exhausting, and I really don't feel encouraged to post any more experiments. Maybe that'll make some of you happier.

JBArk
 
I hope I speak for most Nexians who have been watching this thread evolve when I say your coherent and clear work coupled with your willingness to share it with all of us IS appreciated.

Perhaps the hardcore chemistry bods here, including 69ron, collaborate to establish a clearer more definitive definition of what 'A/B' and 'STB' actually comprises of? A definition which is workable and acceptable to all-or if not all, the majority.

Once again your efforts I believe are certainly valued here:wink:
 
corpus callosum said:
I hope I speak for most Nexians who have been watching this thread evolve when I say your coherent and clear work coupled with your willingness to share it with all of us IS appreciated.

Perhaps the hardcore chemistry bods here, including 69ron, collaborate to establish a clearer more definitive definition of what 'A/B' and 'STB' actually comprises of? A definition which is workable and acceptable to all-or if not all, the majority.

Once again your efforts I believe are certainly valued here:wink:

Thank you corpus callosum. It's nice to get some positive feedback.:)

Cheers,
JBArk
 
ADDENDUM :

As a not-too-hopeful test, I did one last pull from both "A/B" and STB jars (just to see !), and took the naptha I saved from the earlier pulls, combined all and evapped down to about 1/3 the original volume. When I freeze precipped, lo and behold – CRYSTALS !! 585mg !!

I wish I had been more thorough and methodical with this step, but I really wasn’t expecting anything at all – in fact, I did it on a whim as I was prepping the material to throw in the garbage !

This addendum should serve as a warning : no matter how methodical and careful you are in a home lab, there are always more variables than you can control. I must attribute the yield largely to the STB batch, given that the A/B yield was high enough to assume bark exhaustion…

A (very) rough estimate would place the (theoretically) re-xed crystals (with an attributed 500mg to the STB) at around 350mg, bringing the STB yield to (very) approximately 1.1g, and thus 1.1% - clearly more in line with expectations. I will re-x and post a more precise yield.

Not very scientific unfortunately, but like I said, I was inches from throwing it all away. I wish I had separated all these materials and freeze precipped them separately, but it just underlines that you should never throw anything away or abandon proper methodology until you have verified the materials’ exhaustion !

I should mention that due to unforeseen circumstances, the naptha was left in the freezer for 14 days. This may possibly have contributed to the yield, although my freezer hovers between –18C and –20C, and I have always assumed that at this temperature even 24 hours was overkill…

I hope this adds a little to the knowledge database that is the nexus.
Cheers,
JBArk
 

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thanks for the thread jbark, was an interesting read. you've inspired me to conduct a similar experiment, as being in Australia, the Acacia tree is generally used instead, i have heard it doesn't go so well with STB but it would be interesting to give it a try
 
Hello all,

I read through a few pages of this thread and although I don't have time to read every post I thought I would throw my two cents in. Forgive me if this has been discussed previously here. My new tek is A/B plus a separate extraction on the strained mimosa. During the last couple of A/B extractions I have saved the strained mimosa bark, placed it in another mason jar and then proceeded to do an extraction on the left over bark instead of discarding it. Each time I have done this I have pulled anywhere from 200-500 mg of spice on top of my usual 1% yield with my 100g mimosa A/B extraction. The first time I tried it I was skeptical that I would get much but the spice gods were kind. If you're doing an A/B it's worth a try, you never know what goodies are lurking in the left over bark pulp. :lol:

peace

Mush
 
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