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Thin Layer of Film on Naphtha After Final Freeze Precipitation

Skeome

Living the Sapient Dream, Divine Moments of Truth
Hey all, before I go any further, my naphtha evaporates clean. I was Max Ion-ing it up, and decided to pull until depletion. I usually only pull like 5 or 6 times, and idk why I decided I suddenly wanted to pull until nothing precipitated (rather, idk why I wasn't doing this before.)

Anyway, on what I assume to be the depletion pull (I highly doubt there's anything left to pull), I pulled as normal, but didn't have time to take the dish out of the freezer before work, freeze precipitation for a total of 24 hours. When I went to pour off the naphtha, there was a thin, clear layer of film sitting right on top. It doesn't smell like solvent, could this be fats? There were yellowish fats with the crystals, so I really don't know what this film was

OR, because I added a "seed" crystal, maybe it dissolved and spread across the top of the naphtha?
 
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