In my search for most nontoxic and totally safe tek I found one, which finishes with FASA.
It gives more resitant product which is DMT Furmate and that's an advantage.
DMT furmate can be easily turned into DMT Freebase and that's another advantage.
Disadvantage of DMT furmate is its high vaporizing temperature but look at previous sentence.

https://www.dmt-nexus.me...aspx?g=posts&t=2546

Well after I have read this tek I found an information that acetone is not good for first (plant) extracion. So it confused me. I am wondering if citric acid makes the difference and maybe more of it, dissolved in acetone would increase a yields?

Other option: only citric acid + water + MHRB simmered? Then finish with FASA.
Acetone boils in 56 C, water 100 C, citric acid in 125 C.
Temperature increase the reactivity so would there be a problem about dissolving the DMT in this kind of acidic solution (citric acid + water)?

Here's the "extracted" subject of discussion:

The tek:

1) dissolve 5g of citric acid per 100ml acetone

2) take the shredded/powdered bark and cover it with enough citric acid acetone. Incubate in a warm place, gently agitating every so often. After 2-3 hours, filter off the citric-acid saturated acetone extract and set aside (this solution should have acquired the dark reddish colour of MHRB). Repeat 2 more times.

3) saturate acetone with fumaric acid. Acetone can hold ~20mg/ml fumaric acid if let for a day or so to completely dissolve.

4) Add the fumaric acid-saturated acetone in the citric acid-saturated acetone MHRB extract. One cannot put too much.

5) Set it aside and wait for 2-3 days. One should see a yellowish precipitate on the bottom.

NOTE: In step 2 one is making an acetone extraction and at the same time converting the alkaloids their citrate salt. After addition of the fumaric acid-saturated acetone in step 4, there is an interconversion of alkaloid-citrate to alkaloid-fumarate salt, like:

dmt-citrate + fumaric acid <-> dmt-fumarate + citric acid

citric acid has a pKa of 3.13, while fumaric acid's pka is 3.43. Fumaric acid is a weaker acid and thus in the above reaction one should have most of the dmt as a citrate salt and just a tiny amount as a fumarate salt. dmt-fumarate however is totally insoluble in acetone (while dmt-citrate is perfectly soluble), and it precipitates as soon as it forms. The insolubility of dmt-fumarate acts therefore as a "sink" and given time all of the dmt-citrate will eventually convert to dmt-fumarate and precipitate out.

6) wash the precipitated fumarate salts with acetone, then take them out and let them dry.

7) dissolve the alkaloid-fumarate salts in 5ml of tap water, then and then add saturated sodium carbonate to make the solution basic. The alkaloids will be freebased and the solution will become milky. In 3 days they will precipitate out forming nice needle-like crystal in the basic solution. At this stage, one can filter the solution (nasty procedure since the crystals tend to be sticky and waxy) and retrieve any left alkaloids by dissolving them in acetone.

8 ) Let the crystals dry, wash them with acetone (it removes any traces of sodium corbonate which is totally insoluble in acetone), evaporate the acetone and enjoy the product.

Acetone is indeed not a the best solvent for extracting dmt, but inclusion of citric acid seems to help it - but it still takes time...

This tek is more of a proof-of-principle demonstration and even though it appears attractive it is not recommended due to the use of copious amounts of acetone and less than stellar yields. ...you cannot really get any better than water for the bulk of the extraction and leave the more expensive and often not easy to find acetone for other uses, like conversion to freebase or making infused leaf or and/or changa.

Obviously if you go water+citric acid + simmered mhrb you are doing an acid extraction but then if you add FASA as you say nothing will happen. The acetone as the primary solvent in the above tek is used because dmt fumarate is insoluble in acetone.

Well now I see it clearer.
There are two ways that I could go further with my extraction after shimmering MHRB in water citric acid solution.

First:

After shimmering MHRB within acidic solution and filtration of plant material. Water can be evaporated, leaving DMT-citric salt. To avoid unwanted residue non polar solvent like Xylen can be used before the evaporation of water from acidic-DMT solution. Of course nonpolar solvent shall be separated after this process. Good to have a separatory funnel.
Next step would be addition of the Acetone to a vessel where DMT-citric salt have stayed and water had been evaporated.
Last step is to add Furmanic Acid, separate from Aceton-citric acid solution and evaporate the Acetone residue on a product.
As the result DMT-Furmate is recived. Rest is about to change into Freebase (optionally).

Second:

After shimmering MHRB within acidic solution and filtation. We can basify the acidic solution. It is necessary to avoid NaOH if the tek is about to be safe and nontoxic. But now I have no other in my mind. (Before basify the acidic solution there can be a wash like above, done.)
Next step would be addition of the nonpolar solvent to basic solution. This will pull DMT in form of the freebase out of the solution into nonpolar solvent. Xylen or Toluen.
Now the problem is that Xylene and Toluen are not very willing to evaporate or freez.
So after separation of nonpolar solvent containing the DMT freebase, we must mix it with acidic solution. Now we should have Fumaric Acid + Acetone solution. Than unite them.
DMT should precipitate out. Acetone should form separate layers with nonpolar solvent.
DMT Furmate sinks in Acetone right? If so nonpolar solvent can be discarded by pipette.
Last thing that can be done is evaporation of the Acetone residue. Result DMT Furmate.

Now where is the mistake?
Is everything correct?
Normal yields should be expected?
What about DMT-citric salt? Can it be converted into Freebase easier after water evaporation?

I am worrying a bit about the evaporation of acetone becouse of its inflammability but handle with care one should not have chem-fire in a house.

(Acetone is not a problem in my country. I should even say that reagents which I describe above are for hand reach.)