I attempted this tek twice so far, first time seemed successful until I messed it up and the second time is now settling.
On the first try I did the microwave acid cooks and pulled with 95% ethanol in the fridge. I ended up with 0.63 g (2.5 %) semi solid goo from 25 g ACRB. I then based the leftover bark and pulled directly with ethanol, this gave around 0.35 g (1.4%) goo that hardened. A total of 3.9% yield, a significant amount of contaminants, I used to get around 1.8% goo with naphtha pulls on this bark. At this point I assumed the contaminants are mainly calcium hydroxide and/or calcium tannate, both insoluble in the ethanol but the ethanol remaind cloudy even with filtration, it seems like there are very fine particles suspended that are hard to filter. The calcium hydroxide would eventually turn into calcium carbonate and I thought once I redissolve with 95% ethanol to make changa I'd be able to get rid of most of it by filtration. However, when I added the ethanol the majority of the mass refused to dissolve. At first I left the ethanol covering the goo without stirring and after few hours it seemed to strip away the color but the goo still had its form and did not dissolve. So I tried to dissolve it by stirring in a hot water bath, but it turned into a granular sticky mess like crystalized honey and adding more ethanol did not help. It got so messy everything became sticky and smelling of dmt, and the pipette clogged and I splashed some into the water bath, luckily there wasn't a lot of water.
In an attempt to fix this mess I redissolved and washed everything with acetic acid, I would guess with all the additional water I ended up with roughly 40-50% ethanol. I then based it with calcium hydroxide and after settling and filtering the solution was very cloudy, I placed it in the freezer for a couple of days and a kind of gel substance crashed out, a lot of it, I believe that's calcium acetate. After filtering, the alcohol became clear and after evaporating it I got 1g of obviously contaminated dmt, not sure how to describe it, it's not goo but also not powder, it scrapes in sheets. I think with the lower ABV there was still a significant amount of calcium acetate dissolved. And I now believe the major contaminant when I attempted to dissolve the goo and got a sticky mess was calcium acetate, since I used acetic acid for the microwave cooks.
The big lesson from the first attempt is NO ACETIC ACID! The calcium acetate is an unwelcome addition to the mix, even if it's insoluble in high proof alcohol it's still problematic for filtering.
I believe I lost a lot of the dmt but it's fine I learned some things in this first attempt. I think I will proceed by placing the contaminated dmt in a small glass funnel with cotton in the neck, wash it a couple of times with with slightly basic water, then wash it with hot ethanol onto some leaf. I don't have high hopes for this but I'll get a rough estimate on yield via self bioassay.
Here's a picture of the gel (calcium acetate) the yellow color is from the dmt enriched ethanol.
For the second attempt, I still did the microwave cooks but with no acid, and I performed the pulls at room temp. The pulls came out darker in color. And now after basing and letting it settle in the freezer for a day, it is still cloudy. I will seperate the alcohol and put it back in the freezer until I can continue working on it. I plan to evap it and then maybe perform a water wash, hopefully this time without the calcium acetate thing would be better. Any thoughts on ways to proceed to minimize the contaminants?
Regarding the contaminants calcium carbonate and calcium tannate, it does seem concerning to smoke that according to the LLM.
I assume the contaminants profile of the ecotek extract is the same and people have smoalked it, so I am not sure how concerned I should be.
Edit: the ecotek uses sodium carbonate so things are different there.
One more thing, when I was drying the 0.35 g goo, at the end I placed the dish on the hot oven exhaust to finish the drying. It got very hot very quickly, I was gone for 1 min and it started smelling like burnt dmt. Although there was no visible vapors coming out of the dish, I am thinking the dmt started to oxidize, so is the nasty smell that of the dmt oxide?