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(a) Identity. The color additive pyrogallol is 1,2,3-trihydroxybenzene.
(b) Specifications. Pyrogallol 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 good manufacturing practice:
Melting point, between 130deg. and 133 deg.C.
Residue on ignition, not more than 0.1 percent.
Lead (as Pb), not more than 20 p/m (parts per million).
Arsenic (as As), not more than 3 p/m.
(c) Uses and restrictions. Pyrogallol may be safely used in combination with ferric ammonium citrate (as listed in § 73.1025), for coloring plain and chromic catgut sutures for use in general and ophthalmic surgery, subject to the following restrictions:
(1) The dyed suture shall conform in all respects to the requirements of the United States Pharmacopeia XX (1980).
(2) The level of the ferric ammonium citrate-pyrogallol complex shall not exceed 3 percent of the total weight of the suture material.
(3) When the sutures are used for the purposes specified in their labeling, there is no migration of the color additive to the surrounding tissues.
(4) If the suture is a new drug, an approved new drug application, pursuant to section 505 of the act, is in effect for it.
(d) Labeling. The label of the color additive shall conform to the requirements of § 70.25 of this chapter.
(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.
[42 FR 15643, Mar. 22, 1977, as amended at 49 FR 10089, Mar. 19, 1984]
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