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

Formaldehyde	Yellow	Brown
Formic acid	Blue	Yellow
Fuel oil, N.O.S	Yellow	--- --- ---
Fuels: JP, RP, RS, diesel, N.O.S.	Yellow	--- --- ---
Fumigant, carbon dioxide --- ethylene oxide mixture	Gray	Blue
Furfural	Blue	Yellow
Gasoline (motor fuel)	Yellow	--- --- ---
Helium	Gray	--- --- ---
Hydrazine	Brown	Yellow
Hydrocarbons, heavy: Hexanes, Heptanes, octanes, N.O.S.	Yellow	--- --- ---
Hydrochloric acid	Blue	--- --- ---
Hydrocyanic acid	Brown	--- --- ---
Hydrofluoric acid	Brown	--- --- ---
Hydrofluorosilic acid	Blue	--- --- ---
Hydrogen	Yellow	--- --- ---
Hydrogen bromide	Brown	--- --- ---
Hydrogen chloride, anhydrous	Brown	--- --- ---
Hydrogen cyanide, anhydrous	Brown	Green
Hydrogen fluoride, anhydrous	Brown	Green
Hydrogen, liquid	Yellow	Gray
Hydrogen peroxide	Green	Blue
Hydrogen sulfide	Yellow	Brown
Hydroxyacetic acid (glycolic acid), aqueous solutions	Blue	--- --- ---
Ink (solvent type), N.O.S.	Yellow	--- --- ---
Insecticide, liquid, N.O.S.	Brown	Yellow

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