I'm not sure, but I've had good yields with an A/B by leaving the bark to soak for a couple of days, but I also used a very low pH Hcl mix, which I don't like to do anymore.

A/B's generally give a cleaner product anyway.

Isopropanol is not good for recrystallisation, the spice is extremely soluble in it (more so in acetone though) so yes, naphtha or hexane is the way to go!

Isopropanol is not good for recrystallisation, the spice is extremely soluble in it (more so in acetone though) so yes, naphtha or hexane is the way to go!

Surely if the ISO is left to evap at room temperature it will do so slowly and you get good crystals though?

That's what I thought was meant by recrystalisation, as opposed to freeze precipitation.

more like a supersaturated sludge.
crystallization is performed in a solvent in which the solute is marginally soluble in when hot, and completely insoluble when cold.

how do you know it's pure? have you done a melting point test? (the most elementary way to test for purity)

Ah, I get ya.

I have much to learn

Thank you all for your advice. If I add a recrystallisation step to my extraction I'll count out Iso. I'll probably stick to naphtha (following satisfactory results from an evap test of course).

Peace and Thanks,

Macre.

After reading through this thread I have to say this is not a new tek. It's a STB with an A/B cleanup.

One can go back and forth from A/B/A/B/A/B over and over and over again, with loss of yield each time you flip solvents.

I personally think a solid A/B with a defat in the acidic stage will outperform this tek; I see nothing positive this tek has that an A/B tek doesn't.

No offense to the OP. I'm not saying the tek is bad, only that it is not original.

I think this tek IS better than a STB tek, but I'm prejudice against STBs.

Also, IPA, in my experience is horrible at dissolving spice. I get more of a colloidal when I try and dissolve spice in warm IPA. I didn't get it boiling hot, just warm, so maybe at a higher temp DMT will dissolve in it.

I'm going to use this tek in my second extraction, for the sake of experimentation. Although my first extraction will be an A/B.

Although I've never performed an extraction, I've always felt more steered towards and A/B than a STB. Apart from the fact that I hear alot about an A/B giving a purer product (I'm all about quality), it just feels right also.

This tek is the first STB type that I've liked the look of, so I will try it for the sake of experimentation.

Peace,

Macre.