A synthetic azo dye used to impart a vibrant lemon-yellow color to cosmetic formulations. This water-soluble pigment ensures visual consistency and aesthetic appeal in everything from shampoos to skincare serums.
- INCI Name:
- Tartrazine
- Chemical/Scientific Name:
- Trisodium 5-hydroxy-1-(4-sulfonatophenyl)-4-(4-sulfonatophenylazo)-H-pyrazole-3-carboxylate
- Common Aliases:
- CI 19140, FD&C Yellow No. 5, Acid Yellow 23, E102
| Category: | Colors |
| Source Origin: | Synthetic (Petroleum-derived) |
| Comedogenic Rating: | 0–1 |
| Primary Industries: | Cosmetics, Pharmaceuticals, Food |
| Solubility: | Water |
At a Glance: Properties & Effects
| Formula Stability: | |
| Irritation Risk: | |
| Comedogenicity: |
Primary Benefits:
- Provides precise color matching and aesthetic uniformity in liquid products.
- Maintains high stability when dissolved in Aqua based systems.
- Allows for the creation of secondary colors like green or orange when blended with other dyes.
Potential Risks:
- Potential for contact dermatitis in individuals with specific azo dye sensitivities.
- May cause cross-reactivity for those with aspirin allergies.
Biological Action & Cosmetic Profile
Synthetic colorants serve an exclusively aesthetic purpose within the cosmetic landscape. As an azo dye, this molecule absorbs specific wavelengths of light to reflect a vivid yellow hue. Unlike active substances such as Salicylic Acid, which penetrate the stratum corneum to perform biological functions, colorants remain primarily on the surface or within the product matrix itself. Their inclusion is often necessary to mask the naturally unappealing brownish or yellowish tints of botanical extracts or raw chemicals.The molecular structure features a pyrazole ring, which contributes to its high water solubility and ease of incorporation into gels, lotions, and cleansers. Because it does not interact with the skin’s biological pathways, its primary “action” is the psychological and sensory reinforcement of a product’s identity. For instance, a “citrus” cleanser often utilizes this dye to align its visual appearance with consumer expectations of the scent profile.Reliability in manufacturing is a key characteristic of this pigment. It exhibits excellent resistance to pH fluctuations often managed by Citric Acid, though it may fade if exposed to prolonged UV light without the presence of stabilizers or opaque packaging. In formulas containing Glycerin or other humectants, the dye remains evenly dispersed without precipitating out of the solution.
Broader Applications & Origins
While predominantly used in cosmetics, this dye is ubiquitous in the food and pharmaceutical sectors. It was first synthesized from coal tar derivatives, though modern production methods utilize petroleum-derived precursors to ensure high purity and low heavy metal content. Regulatory bodies like the FDA and the European Commission strictly control its purity levels to minimize potential contaminants like aromatic amines.
Routine Integration
Synergies:
- Works effectively alongside preservatives like Sodium Benzoate to maintain product shelf-life and visual integrity.
- Blends seamlessly with Blue 1 (CI 42090) to achieve various shades of green in personal care products.
Conflicts:
- Unstable in highly oxidative environments unless paired with antioxidants.
Clinical Consensus & Safety
The Scientific Committee on Consumer Safety (SCCS) and the Cosmetic Ingredient Review (CIR) Expert Panel have both confirmed the safety of this colorant in topical applications. Extensive dermatological testing indicates that the risk of skin sensitization is extremely low for the general population. However, labeling is mandatory in many jurisdictions because a small subset of the population may experience “Yellow 5” hypersensitivity, particularly if the product is applied to mucosal membranes or used in oral care. Current global regulations permit its use in all cosmetic categories, including products intended for use near the eyes.
Is Tartrazine safe for sensitive skin?
Most users with sensitive skin can tolerate this ingredient without issue, as it is non-penetrative and used in very low concentrations. If you have a known allergy to azo dyes or aspirin, a patch test is recommended.
Why is this dye used instead of natural yellow colors?
Synthetic dyes offer superior stability, batch-to-batch consistency, and cost-effectiveness compared to natural alternatives like turmeric or riboflavin, which can degrade quickly when exposed to light or air.
Can this ingredient cause acne?
This dye has a comedogenic rating of 0 to 1, meaning it is highly unlikely to clog pores or trigger breakouts, even in oily or acne-prone skin types.