Interestingly this drum, left out longer did have a bit of cloud that had settled out.
Had this drum been previously 'fuged?
How effective is 'fuging at preventing the formation of solids if the temp drops after the fuel was 'fuged?
Similar to the previous stuff I got out this melts at 44 deg c and then firms up at 41 ish deg. Each time you reheat it and cool it, it seems to get firmer.
When you heat a solid sample and melt it all, then re-cool, does the whole lot go solid, or is there a layer of liquid on top (perhaps trapped bio?). How long does the solid take to re-form - is it immediate on dropping below 41C or does it take a few cycles outside?
Tony ref the first question, I can only guess based on logic (needs a bit more experimentation). But it kinda makes sense that if this stuff melts at between 45 - 50 degs, there can only be so much of it in the fuel, as bio will freeze at a certain temp, but then melt as it comes below it's freezing point. This stuff behaves very differently.
My guess is that it probably takes something like -4 to -6 deg (?) for a period of time for it all to form, but once it's formed and filtered out. The slight caveat to that view is the one drum that produced more than the rest, maybe 30% or 40% overall - the update to the last photo posted was that a 2nd session with the fuge produced no more waxy stuff.
The other noticeable thing is that after the wax comes out the fuel appears to have a lower viscosity even at very cold temps.
As to the other question, the high melting point stuff, all goes solid after melting then cooling.