Indigo CAS#482-89-3
1. Long Historical Significance: Indigo has been used as a vat dye for over 3,000 years, demonstrating its long-standing reliability and cultural value.
2. Proven Dyeing Performance: Its historical reference—“blue comes from blue and is better than blue”—highlights its superior dyeing quality compared to its plant source.
3. Natural Origin: Indigo is derived from natural plants such as bluegrass, making it a traditional and naturally sourced dye.
4. Wide Early Adoption: Even before the Qin and Han dynasties, indigo was already widely used, reflecting its strong effectiveness and established acceptance.
Products Description of Indigo CAS#482-89-3
Indigo is a traditional vat dye with a history spanning more than 3,000 years. Xun Kuang’s well-known saying from the Warring States period—“Blue is extracted from bluegrass, yet surpasses bluegrass in color”—originated from the indigo dyeing craftsmanship of that era. In this context, “qing” refers to cyan, while “blue” denotes the bluegrass used to produce indigo. Long before the Qin and Han dynasties, indigo had already been widely used.
Indigo Chemical Properties
| Melting point | >300 °C(lit.) |
| Boiling point | 405.51°C (rough estimate) |
| Density | 1.01 g/mL at 20 °C |
| Vapor pressure | 0Pa at 100℃ |
| Refractive index | 1.5800 (estimate) |
| Fp | >220℃ |
| Storage temp. | Sealed in dry,Room Temperature |
| Solubility | DMSO (Slightly, Heated, Sonicated), DMF (Slightly) |
| Form | Powder |
| Colour Index | 73000 |
| Pka | -3.83±0.20(Predicted) |
| Color | Dark blue to violet |
| Water Solubility | <0.1 g/100 mL |
| Merck | 144,943 |
| BRN | 88275 |
| Stability | Stable. Incompatible with strong oxidizing agents. |
| InChIKey | COHYTHOBJLSHDF-BUHFOSPRSA-N |
| LogP | 2.7 at 23℃ |
| CAS DataBase Reference | 482-89-3(CAS DataBase Reference) |
| NIST Chemistry Reference | c.i. Vat blue 1(482-89-3) |
| EPA Substance Registry System | C.I. Vat Blue 1 (482-89-3) |
Safety Information
| Hazard Codes | Xi,Xn |
| Risk Statements | 36/38-36/37/38-48/20/21/22 |
| Safety Statements | 26-36 |
| RIDADR | UN 3264 8/PG 3 |
| WGK Germany | 1 |
| RTECS | DU2988400 |
| HS Code | 32041510 |
| Hazardous Substances Data | 482-89-3(Hazardous Substances Data) |
| Toxicity | LD50 oral in mouse: > 32gm/kg |
Product Application of Indigo CAS#482-89-3
Indigo is used as a food colorant, and national regulations specify allowable applications and dosage limits. It may be added to red and green silk at a maximum level of 0.02 g/kg. In fruit juice (or flavored) beverages, carbonated drinks, prepared wines, candies, pastries, color-coated foods, dyed canned cherries (for decoration), and green plums, the permitted maximum level is 0.10 g/kg. For pickled side dishes, the maximum allowable amount is 0.01 g/kg.
