"Actually Swim has found that the larger % of non-safrole constituents the oils has, the longer and more symetrical
the crystals will be"
I also have noticed this.
I got sick and tired of trying to start a crystal, especially during these hot months. So I decided to try using "Duster" brand computer canned air sprayer. It's 1,1,1, 2-tetrafluroethane. I knew it had a low boiling pt solvent and figured it should disolve the oil and precipitate the frozen seeds as the solvent evaporates. I also figured that it would be best since there is no lubricating oils in it like freon R-12 cans avail at Wally world. Put it in the freezer to prechill it and the oil sample too. However once I got the solvent in the bottle and poured in about a 15ml oil sample, I found out it wan't miscible and floated on top of the solvent. I swirrled it and few times and sat it back in the freezer for 5 minutes. Nothing. This time I shook the open bottle a little and the whole thing turned into a weird white mass of trapped air bubbles, a helleva lot of frozen condensation (looked like 25ml water in it, now frozen) with the mass hold the oil. So I gues it worked, but the damn crystals a probably too small to sift out of the white mass. Maybe I can get the water to slowly melt leaving the crystals.