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

TABLE II. Classification of materials in piping systems

Material	Primary color warning	Secondary color warning
Acetaldehyde	Yellow	Blue
Acetic acid, aqueous solution	Blue	Yellow
Acetic acid, glacial	Blue	Yellow
Acetic anhydride	Blue	Yellow
Acetone	Yellow	--- --- ---
Acetone oils	Yellow	--- --- ---
Acetyl chloride	Blue	--- --- ---
Acetylene	Yellow	--- --- ---
Acid, liquid, N.O.S.	Blue	--- --- ---
Acrolein	Brown	Yellow
Acrylonitrile	Yellow	Brown
Aerosol insecticide	Gray	--- --- ---
Air, compressed	Gray	Green
Alcohol, allyl, liquid	Yellow	Brown
Alcohol, amyl, butyl, ethyl, propyl, N.O.S.	Yellow	--- --- ---
Alcohol, methyl	Yellow	Blue
Alkaline corrosive liquids, N.O.S.	Blue	--- --- ---
Aluminum borohydride	Yellow	Brown
Ammonia, anhydrous	Brown	Yellow
Amyl acetate	Yellow	--- --- ---
Aniline (oil), liquid	Brown	Yellow
Argon	Gray	--- --- ---
Argon---oxygen mixture	Green	--- --- ---

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

Material	Primary color warning	Secondary color warning
Arsenic trichloride	Brown	Blue
Material	Primary Color	Secondary Color Warning
Arsenical acids and Liquids, N.O.S.	Brown	Blue
Benzaldehyde	Yellow	--- --- ---