Petrol is a color that belongs to the color family Dark Cyan. It is a blue-green color that is darker than teal and has slightly more green pigment than ocean blue. The color is described as a grayish-blue color that has a green undertone and can be mistaken for teal. In the additive (digital) color space RGB (Red, Green, Blue), it corresponds to 0% Red, 37% Green, and 42% Blue. In the subtractive (process/print) color space CMYK (Cyan, Magenta, Yellow, Black), it corresponds to 100% Cyan, 10% Magenta, 0% Yellow, and 58% Black.

It is important to note that the color of petrol used to describe the liquid fuel used in cars is not related to the color of the word. The color of petrol used in cars can vary depending on the type of fuel and its additives, but it is usually a clear or slightly yellowish liquid.