21 CFR § 82.1334 - D&c Red No. 34.

---
identifier: "/us/cfr/t21/s82.1334"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 82.1334 - D&C Red No. 34."
title_number: 21
title_name: "Food and Drugs"
section_number: "82.1334"
section_name: "D&C Red No. 34."
chapter_name: "FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES"
subchapter_number: "A"
subchapter_name: "GENERAL"
part_number: "82"
part_name: "LISTING OF CERTIFIED PROVISIONALLY LISTED COLORS AND SPECIFICATIONS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "21 U.S.C. 371, 379e, 379e note."
regulatory_source: "42 FR 15669, Mar. 22, 1977, unless otherwise noted."
cfr_part: "82"
---


# 82.1334 D&C Red No. 34.

Calcium salt of 3-hydroxy-4-[(1-sulfo-2 -naphthalenyl)azol-2-naphthalenecarboxylic acid.

Sum of volatile matter (at 135 °C) and chlorides and sulfates (calculated as sodium salts), not more than 15 percent.

2-Amino-1-naphthalenesulfonic acid, calcium salt, not more than 0.2 percent.

3-Hydroxy-2-naphthoic acid, not more than 0.4 percent.

Subsidiary colors, not more than 4 percent.

Total color not less than 85 percent.