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

Sulfur dichloride	Brown	--- --- ---
Sulfur dioxide	Brown	Gray
Sulfur hexafluoride	Gray	--- --- ---
Sulfur monochloride	Blue	--- --- ---
Sulfur trioxide	Brown	Green
Sulfuric acid	Brown	Green
Sulfuric acid, fuming (Oleum)	Brown	Green
Tetraethyl lead	Brown	--- --- ---
Tetrafluoroethylene, inhibited	Gray	--- --- ---
Thionyl chloride	Brown	Green
Tin tetrachloride, anhydrous	Blue	--- --- ---
Titanium tetrachloride	Blue	--- --- ---
Toluene	Yellow	Brown
Triamylamine	Brown	Yellow
Tributylamine	Yellow	Blue
Triethanolamine	Blue	Yellow
Triethylamine	Brown	Yellow
Trimethylamine, anhydrous	Brown	Yellow
Turpentine	Yellow	--- --- ---
Unsymmetrical dimethyl hydrazine	Brown	Yellow
Vacuum (non---contaminated)	Gray	--- --- ---
Varnish	Yellow	--- --- ---
Vinyl bromide	Blue	--- --- ---
Vinyl chloride	Yellow	--- --- ---
Vinyl methyl ether	Yellow	Blue
Waste acid (spent nitrating acid)	Blue	Yellow
Water, over 50 psig or 150o F	Gray	--- --- ---
Water, fire	Red	--- --- ---

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