FD&C Red No. 4 (Ci 14700)
What is FD&C Red No. 4 (Ci 14700)?
FD&C Red No. 4, also known as CI 14700, is a synthetic organic colorant belonging to the azo dye family. Chemically, it is the disodium salt of 3-hydroxy-4-[(4-methyl-2-sulfophenyl)azo]-2,7-naphthalenedisulfonic acid. Produced through diazotization and coupling reactions, it appears as a bright red powder soluble in water. In cosmetics, it serves as a color additive primarily in rinse-off products like shampoos, bath gels, and soaps. It functions by selectively absorbing specific wavelengths of visible light, imparting a stable, vibrant red hue to formulations. This helps achieve uniform coloration across production batches and maintains appearance during use, without affecting product texture or performance.
Roles in Formulation
This ingredient serves the following purposes in cosmetic formulations:
Benefits
Delivers consistent, vibrant red coloring for appealing product visuals.
Supports batch-to-batch shade uniformity in formulations.
Enhances aesthetic experience in rinse-off personal care items.
Who It's For
A quick guide for who this ingredient may suit (and who should be cautious).
| Who May Benefit | Who Should Avoid |
|---|---|
| Individuals using colored bath and shower products. | Those with sensitive skin prone to dye reactions. |
| People seeking visually striking rinse-off cosmetics. | Users applying products near eyes or lips. |
| Formulators needing water-soluble red pigments. | People with known azo dye allergies. |
Safety Notes
- Approved for external cosmetic use with restrictions excluding eye area and lips.
- May cause irritation or sensitization in some individuals.
Frequently Asked Questions about FD&C Red No. 4 (Ci 14700)
What products commonly contain FD&C Red No. 4?
Found in rinse-off items like shampoos, bath products, and soaps for red coloring.
Is it suitable for facial skincare?
Typically used in non-facial rinse-off products; avoid near eyes or on sensitive facial skin.
Does it pose allergy risks?
Potential for skin sensitization in sensitive individuals, per safety assessments.