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Shaking risks emulsions. Swirl! Or roll it upside down, right side up, over and over, making sure the cap stays on tight.

The one time I was foolish enough to shake my layers would not separate. I seal the lid tight then use a gentle back and forth rocking motion. Imagine the container mounted in an extremely slow motion paint can mixer - that kind of rocking motion. Keeping it gentle/slow and steady pulls the DMT for me every time. I'm hardcore. I do at least four pulls, each one rocking for 6-7 minutes on the clock.

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that depends on the saturation level of freebase in the solvent.

if there is barely any dmt in your solvent youll have to get it very cold or evaporate some solvent off first to get it to precipitate out. if the solvent is loaded with dmt its possible that it may precipiate a good bit out at room temp, ive had this happen.

i combined and evapped all my pulls down to 1/3 of the original amount of solvent and had to keep it in a 24/7 hot water bath since hotter solvent holds more dmt and if i didn't the dmt would stop dropping out. as soon as i took it out of the hot water bath i had crystals forming in an 80 degree room.

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It's all good mate. This forums was created with the intention to help people, so with asking qustions you are contributing since the knowledge is spreading

As for your question, if this is your first extraction I would start with a lower amount since there are some things that only practice will teach you.

I reduce the solution and then let it stay still overnight to get all the particles settled. For that reason I wouldn't reduce to such low volumes since if you got 350ml after reducing, it will be maybe 200ml of clear liquid the next morning. I would leave it at 750ml or so, depending on your total volume (all acidic washes combined) and the size of your container/sep funnel. I think 5-10Volume (1l or 2l if the total is 10l) would be OK although I woudln't reduce under 500ml.

As for pulls, I depends on the solvent. Search your solvent + pulls or name the solvent and someone will answer.

DMT concentratiion of different salt forms hasn't been tested as far as I know so it' guesswork.

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That could very well be precipitated DMT if your acid solution was very concentrated, if so adding your non polar solvent should dissolve it. You could just filter it out and wash with slightly basic water and recrystallize. Then do non polar pulls on the black solution as normal to get the rest of your product out.