This subpart covers the denaturation of spirits and the manufacture of articles by proprietors of distilled spirits plants. Denatured spirits are distilled spirits that have been rendered unsuitable for beverage use by the addition of specific amounts of approved denaturing materials. For purposes of this subpart, articles are products that contain denatured spirits and that are made in accordance with this subpart or part 20 of this chapter. Proprietors who are qualified under this part as processors may make denatured spirits and articles in accordance with the provisions of this subpart. Additional requirements regarding the distribution, use, and standards for denatured spirits are set forth in parts 20 and 21 of this chapter.