Colour coding for Nitrous oxide cylinder is
Black
Black with white shoulders
French blue
Gray
(C) French blue IDENTIFICATION OF MEDICAL GAS CYLINDERSGasColor of cylinderPressure at 15degC when full British standard (Body/Shoulder)United StatesLbf/in2Bar1. Oxygen (O2)Black / WhiteGreen19871372. Nitrous oxide (N2O)French blueBlue638443. CyclopropaneOrangeOrange7354. Carbondioxide (CO2)GreyGrey725505. Helium (He)BrownBrown19871376. AirGreyYellow19871377. O^HeliumBlackGreen/Brown19871378. OJC02BlackGreen/Grey19871379. EntonoxBlueBlue/Green1987137
Miscellaneous