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

Caustic potash, liquid (potassium hydroxide)	Blue	--- --- ---
Caustic soda, liquid (sodium hy- droxide)	Blue	--- --- ---
Chloracetyl chloride	Blue	--- --- ---
Chlorine	Brown	Green
Chlorine trifluoride	Brown	Green
Chloroacetone	Brown	Yellow
Chlorosulfonic acid	Blue	Green
Chloropicrin	Brown	--- --- ---
Chloropropane	Yellow	Blue
Chromic acid solution	Blue	Green
Coal gas (see manufactured gas)	Yellow	Brown
Coal tar distillates, N.O.S.	Yellow	Brown
Crotonaldehyde	Blue	Yellow
Crude oil, petroleum	Yellow	--- --- ---
Cyanide, liquid (potassium solutions, sodium solutions), N.O.S.	Brown	--- --- ---
Cyanogen gas	Brown	Yellow
Cyclopropane	Yellow	Blue
Decalin (decahydronaphthalene)	Yellow	--- --- ---
Dibromodifluoromethane	Gray	--- --- ---
Dibromodifluoromethane, fire	Red	--- --- ---
Dichloropentane	Yellow	--- --- ---
Diethanolamine	Yellow	--- --- ---
Diethylenetriamine	Yellow	--- --- ---
Difluorochloroethane	Gray	Yellow
Difluoroethane	Gray	Yellow
Diisobutyl ketone	Blue	Yellow

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