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

Kerosene	Yellow	--- --- ---
Krypton	Gray	--- --- ---
Lacquer	Yellow	--- --- ---
Manufactured gas (coal, oil pintsch, producer, water, and N.O.S)	Yellow	Brown
Mercaptans (thioalcohols, N.O.S.)	Yellow	--- --- ---
Mercury compounds (solutions), N.O.S.	Brown	--- --- ---
Methane	Yellow	--- --- ---
Methylamine	Yellow	Brown
Methyl acetate	Yellow	--- --- ---
Methyl acetone	Yellow	--- --- ---
Methyl acetylene propadiene mix- ture (MAPP)	Yellow	--- --- ---
Methyl amyl acetate	Yellow	--- --- ---
Methyl amyl ketone	Yellow	--- --- ---
Methyl bromide	brown	--- --- ---
Methyl bromide, fire	Red	Brown
Methyl chloride	Yellow	Brown
Methyl cyanide (acetonitrile)	Brown	Yellow
Methyl formate	Yellow	Blue
Methyl hydrazine	Brown	Yellow
Methyl mercaptan	Yellow	Brown
Methyl sulfide	Yellow	Brown
Methylene chloride	Blue	Gray
Natural gas, fortified, N.O.S.	Yellow	Brown
Neon	Gray	--- --- ---

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