Quote from: chewytikka on October 26, 2012, 11:23 PM
Sometimes a bit confusing to follow Jerry
Is that 300ml of scum or oil from a 4L base? 
i try to post factually (what i do not what i think) to avoid aggravation which we all don't need or want. the english obviously suffers as a result. must try better but always happy to clarify when needed.
the 300ml is foamy scum.
clearly each to their own on this one as there very different views. i've tried both and can relate totally to chewytikka's words. i always skim full stop - i don't need to ponder the idea as i know the difference.
some bases produce more scum than others. i think the scum comes from the veg and some veg seem to give off more scum than others.
i know that some BIR don't skim.
i know that the technique for removing the scum is not easy to carry out - it's not easy to keep the oil, base and scum separate and there is only a limited window (~20 mins) before it becomes impossible to keep the scum and oil separate. by stirring the base now and then during this say 20 min window the oil can be kept dissolved in the base leaving frequent opportunities when the scum has resurfaced to remove it with a chef spoon.
as with a lot in BIR this is real fine tuning which i see essential to produce best. if other things in the BIR mix are not right then you won't see any difference between stirring it in or skimming it off.
essentially depends on your own personal outlook.