21 CFR 74.1339 - D&C Red No. 39.
(1) The color additive D&C Red No. 39 is o-[p(β,β′-dihydroxy-diethylamino)-phenylazo]-benzoic acid.
(2) Color additive mixtures made with D&C Red No. 39 may contain the following diluents: Water, acetone, isopropyl alcohol, and specially denatured alcohols used in accordance with 26 CFR part 212.
(b)Specifications. D&C Red No. 39 shall conform to the following specifications and shall be free from impurities other than those named to the extent that such other impurities may be avoided by good manufacturing practice:
(c)Uses and restrictions. The color additive D&C Red No. 39 may be safely used for the coloring of quaternary ammonium type germicidal solutions intended for external application only, and subject to the further restriction that the quantity of the color additive does not exceed 0.1 percent by weight of the finished drug product.