The D-limonene tek IS a STB. There is no acid cook. Base is added and solvent is used to pull the mesc. I guess it could be classified as a B/A extraction, but if you wanted you could evap the solvent and get freebase mescaline...not advised though, it's an oil and pretty caustic.
Look for the dry tek (d-limonene dry tek I believe it's called) It uses calcium hydroxide and a minimal amount of water. There is no sludge to mess with. It works just fine using Xylene or Toluene instead of d-limonene.
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