Dribble a little fuel onto a piece of white paper...if it evaporates and
leaves behind a tint, it is avgas; if it spreads out, soaking into the
paper, it is jet fuel.


If it leaves a ring, it's jet fuel. I've been told even a little (like 5%) is
sufficient to leave a visible ring.

But yes, I've seen very pale 100LL. In fact, I've rarely seen really blue
stuff. When I got my license (1980) it was supposed to be as blue as Windex.
(in fact, that's what was used in a slide my ground instructor had to show the
fuel colors - El Monte didn't have 100LL at the time)

To top it off, my fuel tester has little plastic inserts - they are blue. I
wish they'd get smart and make them white or clear.

Jose

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