EPA TO REQUIRE ADDITION OF DYE TO HIGHER-SULFUR DIESEL FUEL

Section 211(i) of the U.S. 1990 Clean Air Act Amendments requires the petroleum industry, beginning Oct. 1, 1993, to differentiate off-highway diesel clearly from highway diesel using a "dye marker" system. Starting Oct. 1, all highway diesel must comply with a maximum sulfur specification of 0.05 wt % and a minimum cetane index of 40 (or a maximum aromatics content of 35%). The U.S. Environmental Protection Agency (EPA) has been authorized to use 1,4-dialkylaminoanthroquinone, a blue dye, to

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