Acid yellow 23 Soluble in water for yellow, slightly soluble in ethanol and soluble fiber. element, insoluble in other organic solvents. The strong sulfuric acid for yellow, yellow solution diluted; In nitric acid solution for yellow. Its water solution with hydrochloric acid discoloration; Add sodium hydroxide is redlight deepened. Used for wool, silk, vinegar, polyamide fiber dyeing and printing directly.
Acid yellow 23's Appearance is yellow powder. Soluble in water, solubility 50g / L (90 ° C), soluble in water yellow. Slightly soluble in ethanol and cellosolve, insoluble in other organic solvents. Red in concentrated sulfuric acid, after dilution There is a yellow solution; it is a yellow solution in concentrated nitric acid. Its aqueous solution plus hydrochloric acid does not change color.
Acid Yellow N,Tartrazine NS,Acid Tartrazine,Acid Yellow P/F,Duramine Yellow T,Dycroacid Tartrazine Y,Dycroacid Tartrazine Yellow BF,Orcoacid Tartrazine X
Acid Yellow 23 used for paper, leather, soap, drug, plastic, aluminium surface shading, can also be used in cosmetics and food coloring.
| Standard | Fiber | Soaping | Persperation Fastness | Oxygen bleaching | Light Fastness | |
| Fading | Stain | |||||
| AATCC | Wool | 2 | 2 | 3 | 1 | 4 |
| ISO | Wool | 2 | 5 | 4-5 | 1 | 4 |
Test Methods | fiber | Alkali resistance | Carbonization | Chlorination discoloration | Oxygen bleaching | Alkali fluff | Acid fluff | potting | soaping | Perspiration | Sun exposure | ||||
discolor | Staining | discolor | Staining | discolor | Staining | discolor | Staining | ||||||||
AATCC | wool | 3 | 5 | — | 1 | 2 | 2 | — | — | 5 | 5 | 2 | 2 | 3 | 4 |
ISO | wool | 3~4 | 4~5 | 5 | 1 | 1 | 4 | 3 | 1 | 3~4 | 2 | 2 | 5 | 4~5 | 4 |
Yes. “Acid Yellow 23” is a synonym for **Tartrazine** (C.I. 19140; CAS 1934-21-0). In different markets you will also see it referenced as FD&C Yellow 5 (US food color), E102 (EU food numbering) or simply as the trisodium salt of the tartrazine molecule. Always verify CAS or CI numbers when purchasing to avoid naming ambiguity.
It’s commonly used as a water-soluble colorant in foods, beverages, pharmaceuticals and cosmetics; as an analytical dye/indicator in laboratories; and as an **acid dye** for protein fibers (wool, silk) where anionic dye-fiber interaction is needed. The permitted applications and maximum use levels vary by country—consult local regulations before formulation.
Quality control commonly uses UV-vis spectroscopy (check absorption around 426–430 nm), thin-layer chromatography (TLC) for identity checks and HPLC for quantitative purity and impurity profiling. Commercial chemical suppliers often provide HPLC purity and certificate of analysis (C of A) — specify the analytical method and acceptance criteria when you order.
Yes — as an anionic “acid dye” it dyes protein fibers like wool and silk under acidic dyeing conditions (typically acidic pH with a suitable leveling agent). Dyeing parameters (temperature, pH, auxiliaries) must be optimized per fiber and recipe; for industrial use run lab trials and document liquor ratios and exhaustion behavior. Avoid using it on fibers that require mordants incompatible with the dye’s anionic nature.
