27 CFR § 19.586 - Byproduct spirits production records.

Each proprietor who manufactures substances other than spirits in a process that produces spirits as a byproduct must maintain daily production records of:

(a) The kind and quantity of materials received and used in production;

(b) The kind and quantity of spirits produced and disposed of; and

(c) The kind and quantity of other substances produced.

(26 U.S.C. 5207)