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The clarity of the biodiesel is also as a result of letting it sit for a longer period of time. It turns out that the pH value drops from a caustic 8 or 9 after one day to close to a neutral 7 after a couple of weeks. It shows that the process continus. It's better aged. :-) Perhaps even an...

According to Google: "The so-called 3/27 test, or Jan Warnquist's test, detects under-converted oil. To perform this test, dissolve 3 ml water-free biodiesel in 27 ml pure methanol in a sealed vial, and see whether any oil drops out. If it does, it's a 'fail'." I might try it later today if I...

It has become an art. :-) I use about 21% methanol any extra stays with the biodiesel, the amount of sodium hydroxide is about 25 ml/l of methanol. The quality of the oil has not changed much over the last couple of years, so the result is pretty constant. I'm not selling any of it so the ASTM...

Not sure, but filters really easy, as a matter of fact filtering for the deuce with its tripple filtering system is probably not necessary. :-) A different recipe? No, I have my fixed formula (I don't do any titration), so with the right combination of grease, oil, temperature and enough...

Occasionally when conditions are right, a batch of biodiesel comes out crystal clear as shown in this image.