under subsection (a), if the contaminant is present at the lower of the following levels: (1) A level that is greater than one part-per-billion by weight of product formation. (2) A level that is greater than one percent of the restriction on the concentration for such contaminant for such use, as determined by the Secretary under section 616(a)(2). (d) Labeling of nanomaterials in cosmetics The Secretary may require that— (1) minerals and other particulate ingredients be labeled as nano-scale on a cosmetic ingredient label or list if not less than 1 percent of the ingredient particles in the cosmetic are 100 nanometers or smaller in not less than 1 dimension