Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise focused on industry of fine chemicals research and develop, produce and sale. Shandong Huashang Chemical Co., Ltd. is located in Shan Dong Ji Nan China. we have the ability to provide you high quality products. More than 90 % of our products are exported to developed countries and regions such as north America, Europe, Japan, South Korea and the Middle East.
Acid Blue 9
1. Basic Information
Name: Acid Blue 9
Alias: Erioglaucine disodium salt, FD&C Blue No.1, C.I. 42090
CAS No.: 2650-18-2
Molecular Formula: C37H34N2Na2O9S3
Molecular Weight: 792.85
Category: Water-soluble triphenylmethane anionic acid dye, food & cosmetic colorant
2. Physical and Chemical Properties
Physical Properties
- Appearance: Dark blue crystalline powder
- Odor: Odorless
- Solubility: Freely soluble in water to form bright blue solution; soluble in ethanol; insoluble in oils and aliphatic hydrocarbons
- Melting Characteristic: Decomposes above 220 °C without clear melting point
- Hygroscopy: Slightly hygroscopic under high humidity
- Aqueous Property: Weakly acidic aqueous solution, stable in soft water and weak acid medium
Chemical Properties
- Molecular Structure: Triphenylmethane parent structure with three sulfonate sodium groups, anionic dye molecule
- pH Stability: Stable within pH 3–10; discoloration and precipitation under strong alkaline conditions
- Thermal Stability: Heat-resistant in conventional food processing temperature; long-time boiling leads to slight color fading
- Photostability: Moderate light fastness; long-term strong ultraviolet irradiation causes gradual fading
- Compatibility: Compatible with other acid dyes, food additives, anionic surfactants; incompatible with cationic surfactants, cationic dyes and strong alkali
3. Main Application Fields
1. Food Colorant (Core Application)
Approved food additive for beverages, candy, ice cream, baked goods, food decorations to adjust blue tone
2. Cosmetic Raw Material
Colorant for oral care products, skin care lotion, makeup, shampoo (excluding lip products with long-term mucosal contact)
3. Textile Dyeing
Dye for wool, silk, nylon and other protein fiber fabrics under acid dyeing process
4. Laboratory & Daily Chemicals
Blue color indicator, coloring agent for dishwashing liquid, toilet cleaning products
4. Quality Specification Table
| Test Item | Standard Specification |
| CAS Number | 2650-18-2 |
| Molecular Formula | C37H34N2Na2O9S3 |
| Appearance | Uniform dark blue crystalline powder without agglomeration |
| Color Strength | 98.0%–102.0% vs standard sample |
| Water Insoluble Matter | ≤0.10% |
| Moisture Content | ≤5.0% |
| Heavy Metals (Pb) | ≤10 ppm |
| Arsenic | ≤3 ppm |
| Residue on Ignition | 22.0%–28.0% |
| Packaging | 25kg PE lined woven bag / plastic drum |
| Storage Condition | Hermetically sealed cool dry warehouse below 25 °C; avoid strong sunlight and alkaline raw materials |
| Transportation Requirement | Common dyestuff solid, moisture-proof packaging, separate from strong alkali cargo |
| Shelf Life | 36 months under intact sealed packaging |
Safety Warning
Low-toxicity mild irritant dyestuff powder. Dust may irritate eyes and respiratory tract; direct long-term skin contact may cause temporary staining and slight dry irritation. All operations shall be conducted in ventilated space with dust mask and chemical-resistant gloves. Avoid mixing with strong alkali to prevent color precipitation. Waste aqueous solution can be treated by flocculation precipitation; solid waste belongs to general industrial dyestuff waste and disposed by licensed hazardous waste treatment institutions.
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