
Acid Yellow 23, also widely known as Tartrazine or FD&C Yellow No. 5, is a synthetic lemon-yellow azo dye.
It is the trisodium salt of 3-carboxy-5-hydroxy-1-p-sulfophenyl-4-p-sulfophenylazopyrazole . Renowned for its bright, greenish-yellow to orange-yellow shade and excellent water solubility, it is one of the most commonly used colorants globally. Its high stability and compatibility make it a staple ingredient in a vast array of applications, from food and pharmaceuticals to cosmetics and industrial products .
Common Names: Tartrazine, FD&C Yellow No. 5, C.I. 19140, Food Yellow 4 .
CAS No: 1934-21-0
EINECS No: 217-699-5
Molecular Formula: C₁₆H₉N₄Na₃O₉S₂
Molecular Weight: 534.36
C.I. Number: 19140
Chemical Class: Monoazo Dye
1.Product Description
Acid Yellow 23, also widely known as Tartrazine or FD&C Yellow No. 5, is a synthetic lemon-yellow azo dye.
It is the trisodium salt of 3-carboxy-5-hydroxy-1-p-sulfophenyl-4-p-sulfophenylazopyrazole . Renowned for its bright, greenish-yellow to orange-yellow shade and excellent water solubility, it is one of the most commonly used colorants globally. Its high stability and compatibility make it a staple ingredient in a vast array of applications, from food and pharmaceuticals to cosmetics and industrial products .
2.Specification
| Property | Specification |
| Appearance | Orange to yellow powder |
| Color | Bright Yellow (Greenish to Reddish shade) |
| Purity | ≥85% |
| Solubility | Water soluble: 100 mg/mL (clear yellow to orange solution) |
| PH Value | 6.0 - 8.0 (1% solution) |
| Lambda Max | 426 - 430 nm |
| Loss on Drying | ≤ 10.0% |
| Shade (compare to standard) | DE<1.0 |
3.Product Application
Textile Dyeing: Ideal for dyeing protein fibers such as silk, wool, and polyamide fibers (nylon). It provides deep penetration and a bright, fast green hue .
Leather Finishing: Used for coloring natural leather, providing a vivid and uniform appearance .
Biological Staining: Commonly used in laboratories as a staining agent for biological specimens .
Analytical Chemistry: Functions as a complexometric indicator. For example, Naphthol Green B (a common type of Acid Fruit Green) can be combined with Acid Chrome Blue K to form the KB indicator, where the color change is sharp and clear .
Inks & Coatings: Suitable for water-based inks, fountain solutions, and specialized coating applications .
4.Features:
Brilliant & Consistent Color: Produces a bright, intense yellow hue with excellent reproducibility across batches.
High Solubility: Easily dissolves in water, making it ideal for liquid formulations, inks, and dyeing processes .
Versatile Application : Suitable for a diverse range of industries, from food and pharmaceuticals to textiles and inks. 。
Good Stability : Exhibits high chemical and photostability, ensuring product quality over time .
High Purity Options : Available in various grades, including high-purity analytical standards and desalted (RO/ Salt-Free) versions for specialized applications .
5.Packaging
Usually is 25Kg/drum or paper box or bag with inner double PE liner Or provide customized packaging according to customer requirements.
6.Our advantage:
1) Provide free samples for testing or comparing the effect difference and cost performance.
2) Fast response speed, customers' questions at any time will be responded to in two hours.
3) Fast delivery: the fastest delivery can be made on the same day.
4)Different packaging solutions: provide various packaging options according to customer requirements.
5)Technical guidance: provide improved whitening and coloring formulas and guidance according to customer production materials.
6) Sample retention or sample mailing before bulk delivery.
7) Providing certificationes, such as Reach certification.
8) Different payment methods: TT LC, etc.
9) Providing door-to-door DDP service.