Whenever in the judgment of the Board such action will promote honesty and fair dealing in the interest of consumers, the Board shall adopt rules fixing and establishing for any food or class of food a reasonable definition and standard of identity, or reasonable standard of quality or fill of container. In prescribing a definition and standard of identity for any food or class of food in which optional ingredients are permitted, the Board shall, for the purpose of promoting honesty and fair dealing in the interest of consumers, designate the optional ingredients which shall be named on the label. The definitions and standard so adopted shall conform so far as practicable to the definitions and standards promulgated under authority of the federal act. (Added 1959, No. 172, § 9, eff. May 12, 1959; amended 1959, No. 329 (Adj. Sess.), § 27, eff. March 1, 1961; 2015, No. 23, § 109.)