; (B) contains ingredients that react with each other or with other substances to form harmful byproducts; or (C) the Secretary has any additional reason to believe that such cosmetic does not meet the safety standard under section 614(a) . (3) Guidance If, under paragraph (2) , the Secretary requires that a brand owner demonstrate that a cosmetic meets the safety standard under section 614(a) , the Secretary shall provide the brand owner with guidance on the data and information that the Secretary requires to evaluate whether the cosmetic meets the safety standard under such section. (c) Notification of failure of Secretary To act If the Secretary fails to act by an applicable deadline under section 616 or this section, brand owners and manufacturers of an ingredient or a cosmetic affected by such failure of the Secretary to act shall issue to the Secretary, the public, and each known customer of the ingredient or cosmetic, a written notice that a determination by the Secretary of the safety of the ingredient for use in cosmetics is pending. 618. Treatment of contaminants (a) Publication of list Not later than 1 year after the date of the enactment of this subchapter, and annually thereafter, the Secretary shall publish a list of contaminants of concern linked to severe acute reactions or long-term adverse health effects, including— (1) ingredients used in cosmetics that may contain contaminants of concern; (2) combinations of ingredients that may create contaminants of concern when such ingredients interact; (3) contaminants of concern that may leech from product packaging into a cosmetic; and (4) any other contaminant of concern identified by the Secretary that are present in cosmetics. (b) Evaluation