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

Benzene (benzol, coal tar light oil)	Yellow	Brown
Benzine (petroleum ether, petro- leum naphtha)	Yellow	--- --- ---
Benzoyl chloride	Blue	--- --- ---
Benzyl chloride	Blue	Yellow
Boron hydrides (alkyl decaborane, alkyl pentaborane, diborane, dihy- drotetraborane, hexaborane, penta- borane, and N.O.S.)	Brown	Yellow
Boron trichloride	Brown	--- --- ---
Boron trifluoride	Brown	Gray
Bromine	Brown	Green
Bromine pentafluoride	Brown	Green
Bromine trifluoride	Brown	Green
Bromoacetone	Brown	--- --- ---
Bromobenzene	Yellow	--- --- ---
Bromochloromethane	Brown	Gray
Bromochloromethane, fire	Red	Brown
Bromotrifluoromethane	Gray	--- --- ---
Bromotrifluoromethane, fire	Red	--- --- ---
Butadiene	Yellow	--- --- ---
Butane (see petroleum gas)	Yellow	--- --- ---
Butyl acetate	Yellow	--- --- ---
Butyl ether	Yellow	--- --- ---
Camphor oil	Yellow	--- --- ---
Carbon bisulfide (carbon disulfide)	Yellow	Brown
Carbon dioxide	Gray	--- --- ---
Carbon dioxide, fire	Red	--- --- ---

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