MIL-STD-101 Color Code For Pipelines And For Compressed Gas CylindersThis standard establishes a common color code for visual warnings to accompany the written identification of materials covered in piping systems and contained in compressed gas cylinders, and to facilitate the segregation of these cylinders at depots. This standard does not define the manner or conditions under which these materials may be used safely.

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MIL---STD---101C

Nitric acid	Blue	Green
Nitric acid, fuming	Brown	Green
Nitrobenzene	Brown	Yellow
Nitrogen	Gray	--- --- ---
Nitrogen dioxide	Brown	Green
Nitrogen peroxide	Brown	Green
Nitrogen tetroxide	Brown	Green
Nitrogen---helium mixture	Gray	--- --- ---
Nitrogen---oxygen mixture	Gray	Green
Nitrogen trifluoride	Blue	Green
Nitromethane	Yellow	Blue
Nitrosyl chloride	Brown	--- --- ---
Nitrous Oxide	Blue	--- --- ---
Oil, hydraulic	Yellow	Gray
Oil, lubricating, N.O.S.	Yellow	--- --- ---
Oil, fish, vegetable, edible, N.O.S.	Yellow	--- --- ---
Oxygen	Green	--- --- ---
Oxygen---carbon dioxide mixture	Gray	Green
Oxygen, electrolytic	Green	--- --- ---
Oxygen fluoride	Brown	Green
Oxygen, liquid (LOX)	Green	Gray
Ozone	Green	Brown
Paint	Yellow	--- --- ---
Paraldehyde	Yellow	--- --- ---
Pentane	Yellow	--- --- ---
Perchloric acid	Green	Blue
1---Pentene	Yellow	--- --- ---

TABLE II. Classification of materials in piping systems ---Continued

Material	Primary color warning	Secondary color warning
Petroleum gas (acetogen, butane--- propane mixture, 1---butene, cyclo- propane, isobutane, neo---pentane, and N.O.S.)	Yellow	--- --- ---