Mixing different colors of Avgas

[mushroom]

Jet fuel is clear or straw-colored.

I mixed 80 and 100LL to see what would actually happen years ago when I was instructing and they turned clear. I don't think it is an urban legend. I think it is something the refiners put into the fuel (or are required to put in) for safety.

 

[stearnst]

I remember being told something about two grades being mixed together and turning "straw" colored. Straw, not yellow, I don't know why. Anybody else heard this?

The Pilot's Handbook of Aeronautical Knowledge says that Jet A is "Colorless or Straw", they make no mention of mixing grades though, other than don't mix "down" octanes.

 

[stearnst]

Oops, Mushroom beat me to it.