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Nice pics, JefFlux. It seems likely that crystals could form for a number of reasons and combinations thereof.

Off the top of my head:

cooling of naphtha
evaporation of naphtha
slow diffusion of alkaloid from the base-dissolved plant material
interaction of diffusing alkaloids with trapped naphtha also diffusing

What would happen if you chucked the whole lot in the freezer? If the aqueous layer froze it would make separating the naphtha a complete doddle. It would be interesting to know how the separating of the crystals from the frozen sludge might shape up.

[QUOTE="downwardsfromzero, post: 3238342, member: 1025"] Nice pics, JefFlux. It seems likely that crystals could form for a number of reasons and combinations thereof. Off the top of my head: cooling of naphtha evaporation of naphtha slow diffusion of alkaloid from the base-dissolved plant material interaction of diffusing alkaloids with trapped naphtha also diffusing What would happen if you chucked the whole lot in the freezer? If the aqueous layer froze it would make separating the naphtha a complete doddle. It would be interesting to know how the separating of the crystals from the frozen sludge might shape up. [/QUOTE]