How to tell if there is petrol in WVO

[alexanderfoti]

Right, I was rushing my filtering procure recently, which involves putting 1l of petrol into each 20l cubie of dirty oil before settling.

Normally I mark them right after I am done, this time I couldn't remember which I had done and tried to mark them with sniffing.

Long story short, any easy way of testing which cubie has the petrol in it?

[Julian]

Smell would seem to be the best way to me.  I once processed some whites which had been thinned with petrol and it was very obvious from the smell.  Warming a sample may make the smell more obvious.

The only other way I can think of would be viscosity, but if the viscosity of the WVO varies cubie to cubie then that won't help much.

[alexanderfoti]

I think I couldn't tell as I there was lots of petrol vapours about.

I will wait a bit and have another sniff

[greasemonkey]

Aye, sniff 'um.
As you say, let the vapour settle a bit, wait till it's cold, you'll soon tell the difference.

Just mind there's no one watching.
It's easy to forget that behaviour like that is considered strange by some folks.

[dgs]

Two thoughts.
if you had 20 litres of wvo in each cubie, the ones with 21 litres of liquid will have the petrol included.

OR,

If the petrol addition indeed encourages 'bottom precipitation' after a few days the cubies with the most precipitation are the petrol dosed ones.

[Glycer-rides]

All good points above.
If none of them provide the answer, at 5% petrol, you could just add another litre to each (if there's room in one...)
10% is used by many, anyway.

Or... mix them together, put back into cubies and add half a litre to each. As if there isn't already enough phaff, eh?