Hmm, curious. Thanks for your answer. I'm doing a research essay on historical alchemy. It appears as if the alchemists were able to get some kind of white salt-like substance from these phenolic compounds, and that it was of essential importance to them.
What if, rather than calcining, we were to separate out from these oils the acetone-soluble portion in cycles by dissolving and decanting, until the acetone is no longer tinged by the oils, and then repeat this with the water-soluble portion? I know this makes things complicated and it's likely that experimentation is needed, but I was sincerely hoping the answer might be able to be arrived at by someone with an education in chemistry (unlike myself).