# 19.382 Formulas.(a) *Approved formulas.* A proprietor must denature spirits according to an approved formula listed in part 21 of this chapter.(b) *Alternate formulas and denaturants.* If a proprietor wishes to denature spirits by using an alternative formula or a different denaturant, the proprietor must apply to TTB for authorization. A proprietor must receive written approval from the appropriate TTB officer before denaturing spirits using an alternative formula or a different denaturant. See also §§ 21.5 and 21.91 of this chapter for additional requirements that apply in these circumstances.(26 U.S.C. 5241)