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Acid black 2 Powder
Acid Black 2 powder, also known as Nigrosine, is a black, water-soluble dye available in powder form. It belongs to the acid dye class and is widely used for dyeing wool, silk, nylon, leather, and in some ink and polish formulations. It produces deep black shades with good color intensity under acidic conditions.
Description
Acid black 2 Powder Uses
Primary Uses
- Textile Dyeing
- Wool & Silk: Acid Black 2 is extensively used for dyeing protein-based fibers like wool, silk, and cashmere due to its strong affinity for these materials.
- Nylon & Synthetic Fibers: Also effective on polyamide (nylon) fabrics, providing deep, wash-fast black shades.
- Leather Industry: Used in leather dyeing for shoes, bags, and upholstery.
- Ink & Printing Industry
- Used in inks for ballpoint pens, stamp pads, and inkjet printing.
- Provides permanent, fade-resistant black coloration in specialty inks.
- Biological & Laboratory Staining
- Sometimes used in microscopy for staining biological specimens.
- Helps in histology for tissue contrast enhancement.
Secondary Uses
- Paper & Packaging Industry
- Used in colored paper production and security printing (e.g., banknotes, certificates).
- Cosmetics (Limited Use)
- Found in temporary hair dyes and cosmetic pigments (regulated for safety).
- Art & Craft Supplies
- Used in fabric paints, markers, and artist’s dyes for textiles.
- Wood Staining
- Occasionally applied in furniture and woodworking for dark finish
Additional information
| CONCENTRATION |
100% |
|---|---|
| AVAILABLE TEXTURES |
Powdery – Fine, dry particles (e.g., baking soda, powdered detergents). |
KEY ATTRIBUTES
1. Basic Identification Attributes
- Chemical Name (IUPAC):
Disodium 4-amino-5-hydroxy-3-[(4-nitrophenyl)azo]-6-(phenylazo)naphthalene-2,7-disulfonate - Common/Trade Names:
- Acid Black 2
- C.I. 50420
- Naphthalene Black 12B
- Eriochrome Black T (similar but distinct)
- CAS Number: [8005-03-6]
- HS Code: 3204.12.00 (acid dyes)
- Molecular Formula: C₂₂H₁₄N₆Na₂O₉S₂
- Molecular Weight: 616.5 g/mol
- Synonyms:
- Acid Black BN
- Lissamine Black 12B
- Wool Black 6BN
2. Physical & Chemical Properties
- Physical State: Fine powder
- Color: Dark bluish-black
- Odor: Odorless
- Melting Point: Decomposes before melting (~300°C)
- Boiling Point: Not applicable (decomposes)
- Density: ~1.5 g/cm³ (bulk density)
- Solubility:
- Water: 50 g/L (20°C)
- Ethanol: Slightly soluble
- Organic solvents: Insoluble
- pH Level: 5-7 (1% solution)
- Vapor Pressure: Negligible
- Flash Point: >200°C (non-flammable)
- Optical Properties: λmax = 570-620 nm (varies with pH)
3. Safety & Hazard Attributes
- Hazard Class (GHS):
- Acute Toxicity (Oral): Category 4 (H302)
- Skin Irritation: Category 2 (H315)
- Eye Irritation: Category 2A (H319)
- NFPA Ratings:
- Health: 2
- Flammability: 1
- Reactivity: 0
- Exposure Limits:
- OSHA PEL: Not established
- ACGIH TLV: Not established
- Reactivity:
- Stable under normal conditions
- Incompatible with strong oxidizers
4. Storage & Handling Attributes
- Storage Conditions:
- Cool, dry place (<30°C)
- Relative humidity <60%
- Away from direct sunlight
- Incompatible Materials:
- Strong oxidizers (peroxides, chlorates)
- Strong acids/bases
- Container Type:
- Sealed polyethylene or polypropylene containers
- Avoid metal containers
- Shelf Life: 24 months minimum
- Special Handling:
- Dust mask (NIOSH N95)
- Chemical-resistant gloves (nitrile)
- Eye protection (goggles)
5. Regulatory & Compliance Attributes
- Regulatory Status:
- EU: Compliant with REACH Annex XVII
- US: EPA TSCA listed
- China: IECSC listed
- Hazard Symbols (GHS):
- Exclamation mark (irritant)
- Not classified as carcinogenic
- Transportation Restrictions:
- Not regulated as dangerous goods
- Proper shipping name: "DYES, SOLID, N.O.S."
- Waste Disposal:
- Incineration at approved facilities
- Not RCRA hazardous (US)
6. Environmental & Health Impact
- Ecotoxicity:
- LC50 (fish): >100 mg/L (96h)
- EC50 (daphnia): >10 mg/L (48h)
- Persistence:
- Moderately biodegradable
- BOD5/COD: 0.1-0.3
- Carcinogenicity:
- IARC: Not classified
- NTP: Not listed
- Biodegradability:
- 30-60% in 28 days (OECD 301B)
SAFETY HANDLING PRECAUTIONS
1. Safety Precautions
Personal Protective Equipment (PPE):
- Gloves: Nitrile or neoprene gloves
- Eye Protection: Chemical splash goggles
- Respiratory Protection: NIOSH-approved N95 mask or higher (for dust)
- Clothing: Lab coat or protective apron
Handling & Storage:
- Handle in a well-ventilated area or under a fume hood
- Avoid creating dust (use wet methods if possible)
- Keep away from oxidizers, strong acids, and bases
- Store in a cool, dry place in a tightly sealed container
- Label containers clearly
Hygiene Practices:
- Do not eat, drink, or smoke while handling
- Wash hands thoroughly after use
- Avoid inhalation of dust
2. First Aid Measures
Inhalation (Dust):
- Move to fresh air immediately
- If breathing is difficult, seek medical attention
Skin Contact:
- Remove contaminated clothing
- Wash affected area with soap and water for at least 15 minutes
- Seek medical attention if irritation persists
Eye Contact:
- Rinse eyes with plenty of water for at least 15 minutes (hold eyelids open)
- Seek immediate medical attention
Ingestion:
- Do NOT induce vomiting
- Rinse mouth with water
- Drink water to dilute
- Seek emergency medical help
3. Firefighting Measures
Fire Hazards:
- Not highly flammable, but may decompose at high temperatures
- May emit toxic fumes (NOx, CO, CO₂) when burning
Extinguishing Media:
- Water spray
- Dry chemical powder
- CO₂
- Foam
Firefighting Precautions:
- Wear self-contained breathing apparatus (SCBA)
- Cool containers exposed to fire with water spray
- Avoid breathing smoke/fumes
4. Spill & Disposal
Small Spills:
- Wear PPE
- Dampen with water to reduce dust
- Sweep up and place in a sealed container
Large Spills:
- Evacuate area
- Contain spill to prevent spread
- Collect for proper disposal
Disposal:
- Treat as hazardous waste
- Follow local regulations for dye disposal
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