(a) For each formula submitted in accordance with § 20.91 covering a toilet preparation made with S.D.A. Formula No. 39-C and containing an essential oil, the manufacturer shall submit a 0.5-ounce sample of the essential oil used in the article. The appropriate TTB officer may also require the manufacturer to submit a sample of any ingredient which is not adequately described in the formula.(b) For each formula submitted in accordance with § 20.91 , the appropriate TTB officer may require the manufacturer to submit a 4-ounce sample of the finished article.(c) The appropriate TTB officer may, at any time, require submission of samples of: (1) Any ingredient used in the manufacture of an article, or;T.D. ATF- 199, 50 FR 9162, 3/6/1985, as amended by T.D. ATF-435, 66 FR 5474, 1/19/2001