Mark you wrote about your test

One smelt off and bad but almost wholesome and lemoney in a way too, the other was just rank.. you can see better the deterioration of the one as there is less...

What strikes me is that there is no scale and if you want to see something you will see it ..

like I saw this test where they put three glasses of courless lime juice on a table and then coloured one red, one blue and left one clear.

Nearly every one thought that the red one was rasberry, the blue one blue berry and the clear one lime.....they were all the same.....lol.

Wonder if you really wanted a sweetness some where in the rank smell of one. Its all interpretive so hard to quantify really.