A proprietor must obtain approval of a formula on form TTB F 5100.51 as provided in §§ 5.192 and 5.193 of this chapter before a proprietor may:
(a)Blend, mix, purify, refine, compound, or treat spirits in any manner which results in a change of character, composition, class, or type of the spirits, including redistillation as provided in § 19.314; or
(b)Produce gin or vodka by other than original and continuous distillation.