21 CFR § 73.575 - Titanium dioxide.
(1) The color additive titanium dioxide is synthetically prepared TiO2, free from admixture with other substances.
(2) Color additive mixtures for food use made with titanium dioxide may contain only those diluents that are suitable and that are listed in this subpart as safe in color additive mixtures for coloring foods, and the following: Silicon dioxide, SiO2 and/or aluminum oxide, Al2 O3, as dispersing aids - not more than 2 percent total.
(b) Specifications. Titanium dioxide shall conform to the following specifications:
(c) Uses and restrictions. The color additive titanium dioxide may be safely used for coloring foods generally, subject to the following restrictions:
(1) The quantity of titanium dioxide does not exceed 1 percent by weight of the food.
(2) It may not be used to color foods for which standards of identity have been promulgated under section 401 of the act unless added color is authorized by such standards.
(e) Exemption from certification. Certification of this color additive is not necessary for the protection of the public health and therefore batches thereof are exempt from the certification requirements of section 721(c) of the act.