So AFOAF told me he recently tried a STB extraction on 250 grams of bark. It was his third extraction. He used a blender to powder the bark then used around 3.2 liters of water and 300 grams of lye.

The whole stuff laied for 24 hrs in 2 jars , being shaken once in a while. He then proceeded to put the jars in a hot water bath and to multiple pulls with lighter fluid(the only solvent one can get around here) .

Around 300ml solvent were used in total. Afterwards he did a sodium carbonate wash on the solvent. then he evaporated around 2/3 of it and afterwards placed the solvent in the freezer for around 24 hours. What he was left with were 2.3...2.2 grams of yellowish crystals and some red goo like substance in a small amount. The smell seems ok but the red goo is probaly there because of the whole warming up the jars thing.

All these things aside, is 2.3 grams an ok yield for a STB?

Also, this FOAF intends to buy some limonene and fumaric acid for future uses. do you guys think the extra hassle involved in a FASW or FASI is worth recycling the solvent? Thanks in advance and it's good to be here

I also get red goo with hot pulls, it's probably plant oils, re-x and it will go away.
1% yield is ok if you used naphta, however you should keep your mimosa mix and pull with IPA/Xylene/DCM later to get all the remaining alcs (toluene would work but it takes ages to evap and smells very harsh).

Well that would be nice but as i was saying he really doesn't have any access to other solvents except naphta. IPA he can also get but at a pretty steep price and he is interested in Limonene because of the reuse value, but that will come pretty expensive also and will be ordered online.
Generally the chemical companies in FOAF's country are pretty suspicious when it comes to an average Joe buying stuff he shouldn't so FOAF is pretty much forced to buy online. Also there are a lot of chemical diluants for sale but none of them has the composition written on them so that's pretty much a crap shoot

Yes I understood, I just meant don't throw it away now, store your jar in a cold dark place and once you have access to wide-range solvents...

And please, no offence but don't use this SWIM/AFOAF/my cat crap, it's useless and makes it very easy to ignore your posts.