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In a real pinch cigarrett ash can be used.  Tobacco can be used for that matter as well.


Damania, Lotus, Wild Lettuce, parsely are all favorites.  I imagine any not too harsh leaf will work, but the smoothest by far is White Lotus. It is litterally like smoking air. It can be bought really cheap on ebay, or any of the ethno online vendors.


When I recrystalize I do not freeze precipitate. I only do that when I first extract. Rather I use the smallest amount of solvent possible to dissolve all of the spice present (and hot solvent really helps with this). Let it sit for a few minutes until all the oils have dropped out, pour out the good naphtha/bestine/hexane (I prefer bestine:naphtha mix 4:1 slows evaporation time, keeps most of the selectivity of heptane, and produces brilliant xtals) and then just cover it losely with some paper towl and let it sit for 2-3 days.  When you see it after three days you will see why I prefer this method. Clusters of clear shiney sword like crystal structures.  They are beautiful to see.


I don't understand your first question, but you are correct about the other two issues.  If you can dissolve enough spice in your solvent, it will precipiate out at room temperature, BUT LET IT EVAP SOME MORE, almost to nothing and you will have giant crystals everywhere.  Bestine (heptane) and Hexane, and to some degree Naphtha all dissolve spice more than they like dissolving oils.


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