Product Description
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.
Product Parameters
| 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 |
Application Scenarios
Qualified indigo is widely used as a legal food coloring agent with strictly defined dosage limits. It can be applied in silk coloring, beverages, carbonated drinks, brewed wine, candies, pastries, coated foods, decorative canned fruits and preserved fruits. The usage dosage varies by category, with precise restricted proportions for pickled vegetables and other products to ensure safe and compliant food production.
