
Product Name: Solvent Black 29 / C.I. 61568
Chemical Name: 1:2 Chromium Complex Azo Dye / Chromium-Azo Complex
Color Index: C.I. 61568 / Solvent Black 29
CAS: 61901-87-9
Molecular Formula: C₁₆H₁₀N₃O₄R
Formula Weight: 437.37 g/mol
Synonyms: Intraplast Black RL; Valifast Black 3870; Orasol Black X 55; Ranbar Black D55-V; Solvent Black RLI; Oil Black; C.I. 61568; Black 3808
Application:
Printing Inks (Gravure, Flexographic, Inkjet), Metal Coatings (Aluminum Cans, Foils, Metal Packaging), Plastics (Masterbatch, Transparent Films, Molded Parts), Wood Stains & Coatings, Leather Finishes, Hot Stamping Foils, Stationery Inks, Automotive Coatings
1.Product Description
Achieve Deep, High-Performance Black Coloration with Solvent Black 29 – The Premium 1:2 Chromium Complex Azo Dye for Industrial Applications.
Solvent Black 29, designated as C.I. 61568, is a high-performance 1:2 chromium complex azo dye that represents the gold standard for industrial black coloration in demanding applications . This sophisticated metal-complex dye features a unique molecular structure where a central chromium ion coordinates with two azo ligand molecules, creating exceptional stability, deep color intensity, and outstanding fastness properties .
What distinguishes Solvent Black 29 from conventional black colorants such as carbon black is its molecular-level solubility and dispersion. Unlike particulate pigments that can cause graininess, poor adhesion, or migration issues, this dye dissolves completely in organic solvents, achieving true molecular dispersion that delivers a deep, transparent bluish-black hue with excellent gloss retention . Its bluish-black shade provides exceptional color depth in thin film systems and transparent substrates .
Key differentiators:
1:2 Chromium Complex Chemistry: The coordinated metal-ligand structure provides superior thermal stability, lightfastness, and chemical resistance compared to non-metallized azo dyes .
Exceptional Heat Resistance: Withstands processing temperatures up to 200°C, with heat stability rated Grade A at temperatures from 108°C to 200°C .
Outstanding Lightfastness: Rated 7-8 (on an 8-point scale), ensuring color stability in outdoor and prolonged-use applications .
Superior Solubility: Highly soluble in alcohols, ketones, esters, and aromatic solvents; solubility exceeds 300 g/L in ethanol, ethyl acetate, and toluene .
Low Migration: The metal-complex structure significantly reduces dye migration, making it ideal for packaging and sensitive applications .
Excellent Chemical Stability: Acid and alkali resistance rated Grade A, ensuring performance in aggressive environments .
2. Product Specifications (Technical Data Sheet)
| Property | Specification | Insight |
| Product Name | Solvent Black 29 (C.I. 61568) | Premium 1:2 chromium complex azo dye |
| Appearance | Deep black to blue-black uniform powder | Fine, free-flowing powder with bluish undertone |
| CAS No. | 61901-87-9 | Verified chemical registry number |
| EINECS/EC No. | 403-720-7 / 612-670-7 | Listed in European inventory |
| Molecular Formula | C₁₆H₁₀N₃O₄R | Chromium-azo complex structure |
| Formula Weight | 437.37 g/mol | Precise molecular mass |
| Solubility (Ethanol) | ≥ 300 g/L | Excellent solubility in alcohols |
| Solubility (Ethyl Acetate) | ≥ 300 g/L | Outstanding solubility in esters |
| Solubility (Toluene/Xylene) | ≥ 300 g/L | High solubility in aromatics |
| Solubility (Water) | < 5 mg/L | Extremely low water solubility, non-bleeding |
| Ionic Style | Non-ionic / Metal Complex Solvent Dye | Excellent compatibility with solvent systems |
| Color Shade | Bluish-black / Blue-black | Deep, transparent black with blue undertone |
| Coloring Intensity | 98-102% (vs. standard) | High tinctorial strength with minimal dosage |
| Purity | ≥ 99% | High purity ensures consistent performance |
| Melting Point | 150-200°C | Decomposes gradually; typical processing safe to 200°C |
| Heat Stability | Grade A (108°C, 150°C, 200°C) | Exceptional thermal stability |
| Lightfastness | Grade 7-8 (1-8 scale) | Outstanding UV resistance |
| Bleeding Fastness (Edible Oil) | Grade 5 | Excellent oil resistance |
| Bleeding Fastness (Butter) | Grade 4 | Good fat resistance |
| Chemical Fastness (Acid) | Grade A | Resistant to 3% phosphoric acid, 24 hours |
| Chemical Fastness (Alkali) | Grade A | Resistant to 3% NaOH, 24 hours |
| Water Insolubles | ≤ 1.0% | High purity with minimal residue |
| Moisture Content | ≤ 2.0% | Low moisture ensures stability |
| Fineness (80 mesh) | ≤ 5% residue | Fine particle size for uniform dispersion |
| Storage Conditions | Store in cool, dry, ventilated warehouse; keep containers tightly sealed; protect from light | Shelf life: 3-5 years under proper storage |
| Packing | 15-25 kg fiber drums / cardboard cartons with PE inner liner; custom sizes available | Secure, moisture-proof packaging |
| Application | Printing inks, metal coatings, plastics, wood stains, leather finishes, hot stamping foils | Versatile across multiple industries |
3.Product Application
Printing Inks – Primary Application:
Solvent Black 29 is the preferred colorant for high-performance printing inks, delivering deep black coloration with exceptional gloss and stability :
| Ink Type | Recommended Dosage | Application Notes |
| Gravure Printing Inks | 3-10% of ink formulation | Excellent solubility in toluene, xylene, and ethyl acetate |
| Flexographic Inks | 3-8% of ink formulation | Compatible with alcohol and ester solvent systems |
| Inkjet Inks (CIJ) | 2-5% of ink formulation | High purity grade required; excellent jetting properties |
| Hot Stamping Foils | 2-8% of coating | Provides deep black with metallic luster |
| Stationery Inks | 2-5% of ink formulation | For pens, markers, and writing instruments |
Metal Coatings & Packaging:
Solvent Black 29 is widely used for coloring metal substrates, particularly in the packaging industry :
| Application Type | Recommended Usage | Performance Benefits |
| Aluminum Cans & Foils | Pre-dissolve in MEK or alcohol mixture | Grain-free, high-gloss finish; low migration |
| Metal Packaging Decoration | 1-5% coating formulation | Excellent adhesion; corrosion resistance |
| Baking Finishes | 1-4% coating formulation | Withstands high-temperature curing |
| Automotive Coatings | 1-3% formulation | Outstanding lightfastness; weather resistance |
Plastics & Polymer Materials:
The dye's excellent heat stability and molecular solubility make it ideal for plastic coloration :
| Polymer Substrate | Recommended Dosage | Processing Conditions |
| Polystyrene (PS) | 0.05-0.2% | Up to 250°C; transparent and opaque applications |
| Polycarbonate (PC) | 0.05-0.15% | Up to 300°C; high heat stability |
| PMMA (Acrylic) | 0.05-0.2% | Excellent clarity and weatherability |
| PET (Polyester) | 0.05-0.15% | Suitable for film and fiber applications |
| ABS | 0.05-0.2% | Good color development |
Wood Finishes & Wood Stains:
Solvent Black 29 is a preferred colorant for wood coating applications :
Wood Stains: Provides deep, transparent black coloration that enhances wood grain.
Violin Varnish: Historically used in high-quality instrument finishes.
Wood Coatings: Suitable for interior and exterior wood finishing.
Leather Finishes:
The dye is widely used in leather processing for:
Leather Sprays: Provides uniform black coloration with good penetration.
Leather Finishing: Excellent compatibility with topcoat systems.
4.Our advantage:
1) Provide free samples for testing or comparing the effect difference and cost performance.
2) Fast response speed, customers' questions at any time will be responded to in two hours.
3) Fast delivery: the fastest delivery can be made on the same day.
4)Different packaging solutions: provide various packaging options according to customer requirements.
5)Technical guidance: provide improved whitening and coloring formulas and guidance according to customer production materials.
6) Sample retention or sample mailing before bulk delivery.
7) Providing certification, such as Reach certification.
8) Different payment methods: TT LC, etc.
9) Providing door-to-door DDP service.
5.Packing information:
Usually is 25Kg/drum or paper box or bag with inner double PE liner Or provide customized packaging according to customer requirements