<prompt> Colour coding for Nitrous oxide cylinder isBlackBlack with white shouldersFrench blueGray  <response>: C French blue IDENTIFICATION OF MEDICAL GAS CYLINDERSGasColor of cylinderPressure at 15degC when full British standard BodyShoulderUnited StatesLbfin2Bar1. Oxygen O2Black WhiteGreen19871372. Nitrous oxide N2OFrench blueBlue638443. CyclopropaneOrangeOrange7354. Carbondioxide CO2GreyGrey725505. Helium HeBrownBrown19871376. AirGreyYellow19871377. OHeliumBlackGreenBrown19871378. OJC02BlackGreenGrey19871379. EntonoxBlueBlueGreen1987137 