What color is 100LL fuel?

100LL aviation fuel is colored blue. The blue coloration of 100LL (which stands for "100 octane low lead") helps distinguish it from other types of fuel that might be used in aviation, such as 80 octane aviation fuel, which is typically colored red. The use of distinct colors for different fuels is a safety measure, ensuring that pilots and ground personnel can easily identify the correct fuel type to use, thus preventing potential fuel contamination or misfuelling incidents. The blue color is a well-recognized standard in the aviation community, making it easier for anyone handling fuel to quickly ascertain which type is present.