; and (2) present in— (A) a rinse-off cosmetic at a concentration at or above 0.01 percent; or (B) a leave-on cosmetic product at a concentration at or above 0.001 percent. (d) Master list (1) In general Not later than 6 months after the date of the enactment of the Cosmetic Fragrance and Flavor Ingredient Right to Know Act of 2023 , the Secretary shall— (A) establish a master list of the chemicals that appear on the lists specified in subsections (b) and (c); (B) post such master list on a publicly available website of the Food and Drug Administration; and (C) establish a voluntary electronic distribution list to which cosmetic manufacturers and other interested parties may subscribe to receive a copy of the master list and any subsequent updates. (2) Updates (A) In general The Secretary shall maintain the master list established under paragraph (1) and make updates to such list as necessary. (B) Notification Not later than 30 days after making an update pursuant to subparagraph (A), the Secretary shall notify subscribers to the electronic distribution list referred to in paragraph (1)(C) of that update. (C) Semi-annual updates Not less frequently than twice per year, the Secretary shall publish on a publicly available website of the Food and Drug Administration a list of updates to the master list made during the preceding 6-month period that includes summaries of any chemicals added to or removed from the lists specified in subsections (b) and (c). 617. Definitions In this subchapter: (1) Brand owner The term brand owner means the entity responsible for bringing a cosmetic to market for retail consumer sale or professional use. (2) Electronically readable format The term electronically readable format means, with respect to information, that the information provided— (A) is machine readable by automated systems, including, web browsers, accessibility software to aid the disabled, automated scripts, and other software programs or applications; (B) is not restricted from access by search engines