I think I may have been successful in freezing asarone out of calamus oil.
First I poured about 10ml of nepalese calamus oil into a shotglass and put it in the freezer on its coldest setting. A day later, it was still unfrozen, at which point I abandoned the experiment and completely forgot about it.
A few weeks later I noticed it while getting some biscuits (mmmm, tasty frozen biscuits!) and checked on it. Interestingly, I saw whitish wartlike crystals awash in a darker yellow mass of crystallized oil. Cool, I thought, so I put it in my fridge. Two days later, it was still frozen solid, so I set it on my fridge to melt a bit, hoping to get a seed crystal. Later that day I came back and there were lots of chunky clear crystals soaking in the now liquid yellow oil (considerably more crystals than oil). I carve a few chunks out and throw them into a chilled shotglass and put it in the freezer, putting the larger crystal mass on the fridge to melt. I noticed when I came back later that as they melted they had separated into layers, the bottom clearish one having that peculiar irridescent sheen we all know and love. Anyhow, I poured this into an emptied soy sauce bottle and added the rest of the amount I had purchased (225ml), then put it into the fridge. After it was good and cold (8hrs) I threw in a seed crystal and went to work. When I got home, the bottle was full of white crystals but it had obviously trapped much yellow oil in the many crevices, not to mention the thick skin at the interface of oil.
So, onto the fridge it goes to melt. When it had melted down to the last few xtals (shaking helps) I put my fridge on "2" (it was on "5" previously) and put it back in there. It kept forming skins on top and trapping the yellow in crevices, so I crystallized and melted until I had huge crystals (~4 times) then turned the thing upside down over another container and collected about 75ml of nasty, stinky, pee-yellow oil.
Thirty percent (most asarone bearing oils being 60-70% asarone) of 225ml is 67.5ml.
After washing the crystals with ice-cold etoh, I let them melt into a very mildly yellow irridescent liquid.
Maybe I should have recorded the temperatures...
This begs the question... What in "Bob"'s name am I gonna do with this nasty stinky not-asarone stuff?