Blue used to be 108/135, but I just checked on this and things have changed. Apparently Avgas 100 is still available, and it's still green, while the Avgas 100 LL is now blue. I haven't flown for a while, (5 years this coming Aug.) and the last 12 years of that was in a homebuilt that I had built. Since I used a converted automotive engine, I could legally use auto fuel, which I did. Things change I guess. Sniper