26 CFR § 48.4082-1 - Diesel fuel and kerosene; exemption for dyed fuel.
(1) The dye Solvent Red 164 (and no other dye) at a concentration spectrally equivalent to at least 3.9 pounds of the solid dye standard Solvent Red 26 per thousand barrels of diesel fuel or kerosene; or
(2) Any dye of a type and in a concentration that has been approved by the Commissioner.
(c) Marking requirements. [Reserved]
(d) [Reserved]. For further guidance, see § 48.4082–1T(d).
(e) Effective date—(1) Except as provided in paragraph (e)(2) of this section, this section is applicable March 14, 1996.
(2) [Reserved] For further guidance, see § 48.4082–1T(e)(2).