color of diesel depends what country you are in
mostly in usa diesel is yellow, non taxed diesel such as offroad diesel is red. it has a dye put in it so DOT know if you are using farm diesel on a highway vehicle
Street diesel is Slightly yellow, off road/agricultural diesel is dyed red. It is that color because it is illegal to use on the street only because D.O.T. tax wasn't applied.
red
The color of synthetic diesel oil is red.
Yellow is the most common color used. If you used any other color be sure and label it Diesel.
the color and diesel is oily.
Yellow
Black
We would describe Mr. Diesel as "flesh-colored."
petrol light brown, diesel light green
A diesel generator can be any color you like...orange with pink polka dots would be nice. However, manufacturers are aware that diesel fuel stains things, so they generally paint with a color that doesn't show diesel oil stains too badly.
green
Green
It sure does seem that way. I would think it is blue.
Black & grey