After I distill the methanol from my glycerin I will get a murky brown layer on top of the glycerin after I add some water to it, mix it up and leave it sit overnight. This doesn't happen on all my batches. It almost looks marbleized. The glycerin below is nice and crisp looking. It's that top layer that has me puzzled. Does anyone have any ideas what it might be? I need to know what to do with it.
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