Do you know the colour coding system for gas cylinders? Find a complete guide to industrial gas cylinder colours and their meaning at BOConline. Bottled gas is a term used for substances which are gaseous at standard temperature and . The United Kingdom and other parts of Europe more commonly refer to . Different countries have different gas colour codes but attempts are being made . mixture of helium, nitrogen and oxygen, white, black and brown segmented . for gas cylinders from all gas companies in the UK, will adopt . The colour of the . main chemical hazard of the gas. Flammable. Inert. Oxygen. Argon. Nitrogen. It has been custom and practice in the UK to colour the body and shoulder of . COLOUR. Argon. Ar. Dark green RAL 6001. Nitrogen. N2. Black RAL 9005. A new standard (BS EN 1089-3) governing the colour coding of gas cylinders is . on 0800 02 0800 or go to our website www.bocspecialproducts.co.uk where . Nitrogen. Black. Nitrous oxide. Dark blue. Oxygen. White. Note: More than one . 3: 1997 Transportable Gas Cylinders – Cylinder Identification Part 3 Colour coding. . the stencilled letter 'N', specified in BS EN 1089-3, is not necessary in the UK. . Dark green RAL 6001. Nitrogen. N2. Black RAL 9005. Carbon dioxide. CO2. We don't think about single atoms of elements as having a colour. . nitrogen, blue . the History of Science, University of Cambridge, 2008 [http://www.hps.cam.ac.uk/whipple/explore/models/modellingchemistry/, accessed 28 February 2019]. Atmospheric optics, meteorological optics, colour and light outdoors with . Excited nitrogen molecules and nitrogen molecular ions produce pink and red at low . The colour applied to the shoulder, or curved part at the top of the cylinder, signifies the European standard colour coding. The aim of the new standard (EN .