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

Dimethyl sulfate	Brown	Blue
Dimethyl sulfide	Yellow	Blue
Diphenyl---diphenyl oxide ("Dow- therm A")	Gray	--- --- ---
Dispersant (dichlorodifluorome- thane---difluoroethane mixture)	Gray	--- --- ---
Electrolyte acid, N.O.S.	Blue	--- --- ---
Ethane	Yellow	Blue
Ethers, anesthetic: diethyl, ethyl, isopropyl, sulfuric, N.O.S.	Yellow	Blue
Ethyl acetate	Yellow	--- --- ---
Ethyl benzene	Yellow	--- --- ---
Ethyl bromide	Yellow	Blue
Ethyl butyl acetate	Yellow	--- --- ---
Ethyl butyrate	Yellow	--- --- ---
Ethyl chloroacetate	Yellow	--- --- ---
Ethyl chloride	Yellow	Blue
Ethylenediamine	Yellow	Blue
Ethyl hexaldehyde	Yellow	--- --- ---
Ethyl lactate	Yellow	--- --- ---
Ethyl methyl ketone	Yellow	Blue
Ethyl nitrate	Yellow	Blue
Ethyl nitrite	Yellow	--- --- ---
Ethyl silicate	Yellow	--- --- ---
Ethylamine	Yellow	Blue
Ethylene	Yellow	Blue
Ethylene chlorohydrin	Yellow	--- --- ---
Ethylene dichloride	Yellow	Blue
Ethylene glycol	Yellow	--- --- ---

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