If you're worried about not getting a good yield with freeze precip, it could be from using too much solvent. You want to use a relatively small amount of solvent so that it's saturated before attempting freeze precipitation. DMT's solubility depends on the temperature of the solvent. People warm up their soup before pulls to maximize the amount of DMT that goes in, leading to more that precipitates when cooled down. I'd bet one of the most common issues, with small extractions under 100g of bark, is using too much solvent.
Here's solubility data for DMT in naphtha:
- Naphtha (20 °C, C6-C7) 2,93 g in 100 ml
- Naphtha in the freezer (-20 °C, C6-C7) 109 mg in 100 ml
If you extract from 80g of MHRB, you can expect there to be at least 1% DMT in there, so 800mg. You're unlikely to pull the entire amount in one pull though, so you might expect 400mg from the first pull on 80g of bark.
You should use the amount of naphtha that would be saturated at room temp.
2.93g / 0.4g = 7.352
100ml / 7.352 = 13.5ml
Don't use more than 13.5ml of naphtha per pull on an 80g batch of MHRB. It's okay to use even less to stay on the safe side, 10ml each pull should ensure something freeze precipitates out.