21 CFR 74.3102 - FD&C Blue No. 2.
(1) The color additive FD&C Blue No. 2 for use in coloring surgical sutures shall conform to the following specifications and shall be free from impurities other than those named to the extent that such impurities may be avoided by current good manufacturing practice:
(c)Uses and restrictions.
(1) The color additive FD&C Blue No. 2 may be safely used for coloring nylon (the copolymer of adipic acid and hexamethylene diamine) surgical sutures for use in general surgery subject to the following restrictions:
(i) The quantity of color additive does not exceed 1 percent by weight of the suture;
(ii) The dyed suture shall conform in all respects to the requirements of the United States Pharmacopeia XX (1980); and
(iii) When the sutures are used for the purposes specified in their labeling, the color additive does not migrate to the surrounding tissues.
(2) The color additive FD&C Blue No. 2-Aluminum Lake on alumina may be safely used for coloring bone cement at a level not to exceed 0.1 percent by weight of the bone cement.
(3) Authorization and compliance with these uses shall not be construed as waiving any of the requirements of sections 510(k), 515, and 520(g) of the Federal Food, Drug, and Cosmetic Act with respect to the medical device in which the color additive FD&C Blue No. 2 and the color additive FD&C Blue No. 2-Aluminum Lake on alumina are used.