Lots of interesting chemistry coming out of this thread, but I do wonder whether the answer might not be in the physics rather than the chemistry of the process. Possibly the glycerol has not fully settled when the upper layers of ester are syphoned off. Then, when the lower level is exposed to cold air, the entrained glyc. solidifies into the reported skin. Why not try a longer (or warmer, with better insulation) settling period before racking off?
David T. Biofuels at Journey to Forever http://journeytoforever.org/biofuel.html Biofuel at WebConX http://webconx.green-trust.org/2000/biofuel/biofuel.htm List messages are archived at the Info-Archive at NNYTech: http://archive.nnytech.net/ To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
