i mean, probs vinegar? if this bark produced too many byproducts maybe a quick'n'dirty method like STB isnt the way to go
it assumes your bark is pure to begin with, which it wont be if theyve added trunk bark for extra mass, it would also have some DMT too so its not like empty cutter, or just ground up the entire roots rather than just their bark, which at a certain scale is probably more convenient if you just have endless stumps you can process. Many convenient teks rely on the fact that DMT is almost the only naptha soluble thing m.hostillis ROOT bark that doesnt also stay in solution at super high concentration or freezing temps, i.e the only thing that crystalizes out when frozen or most of the solvent is allowed to evap away. STB on things other than MHRB require increasing levels of effort to yield a pure product.