Petrol — Petrol has the deep blue-green often called petrol in British usage, giving it its name. It belongs to the Cyan and Green family: a dark, vivid tone with hex code #005F6A and RGB values of 0, 95, 106. Its dominant channel values give it a cool undertone that reads as vivid rather than flat. Petrol pairs well with natural wood tones and warm beiges and works nicely in interior accent walls. Nearest neighbors: turquoise.