Production
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Fiber Grade Titanium Dioxide AMA93
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Solvent Red 207
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Solvent Red 149
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Phthalocyanine blue 15-3
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Solvent blue 104
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Ultraviolet absorber 531
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Optical Brightener BA
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Phthalocyanine green 7
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Solvent Red 52
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Acid Blue 9
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Phthalocyanine blue 15-1
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Solvent Yellow 93
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Optical Brightener CBS-X
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Pigment red 57-1
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Optical Brightener SWN
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Acid Yellow 23 Detergent dye
Acid Yellow 36
Product Name: Acid Yellow 36 / Metanil Yellow
Chemical Name: Sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate
Color Index: C.I. 13065
CAS: 587-98-4
Molecular Formula:C18H14N3NaO3S
Formula Weight: 375.38 g/mol
Synonyms: Metanil Yellow; C.I. Acid Yellow 36; Acid Leather Yellow R; Metanile Yellow O; 3-(4-Anilinophenylazo)benzenesulfonic acid sodium salt; Yellow No. 406; Amacid Yellow M； Acid Yellow 36, Soap Yellow, Golden Orange Yellow G, Meta-amine Yellow, Meta-aniline Yellow, Acid Soap Yellow, Acid Golden Yellow 2G, Acridine Yellow
Application:
Textiles (Wool, Silk, Nylon, Leather), Paper Dyeing, pH Indicators, Biological Staining (Histology), Research Applications, Industrial Colorants
Description
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1.Product Description
Discover the Dual-Function Versatility of Acid Yellow 36 – The Color Chemist's Choice for Industrial Dyeing and Analytical Precision.
Acid Yellow 36, widely known as Metanil Yellow, is a distinguished monoazo dye that bridges the gap between industrial colorant applications and analytical chemistry. This sodium sulfonate salt features a distinctive anilinophenyl-diazenyl structure that delivers a vibrant, clean yellow hue while simultaneously functioning as a precise pH transition indicator . Its dual nature makes it one of the most versatile acid dyes available in the modern colorant market.
What truly sets our Acid Yellow 36 apart is its dynamic color behavior – the molecule undergoes a dramatic and reversible transformation from red to yellow across the pH range of 1.2 to 2.3, with a maximum absorption wavelength (λmax) at approximately 415 nm . This property, combined with excellent tinctorial strength, allows it to serve both as a high-performance textile dye and as a reliable analytical tool.
In histological applications, our grade provides exceptional contrast as a counterstain in Masson's trichrome and PAS-stained sections, where it selectively stains collagen yellow against red muscle tissue, enhancing microscopic visualization . For industrial applications, it offers consistent, level dyeing on protein and polyamide fibers with good solubility and build-up characteristics.
2.Product Specifications (Technical Data Sheet)
| Property | Specification | Insight |
| Product Name | Acid Yellow 36 (Metanil Yellow) | Industry standard for yellow acid dyes and pH indicators. |
| Appearance | Yellow to Orange-Gold to Brown Powder/Crystals | Free-flowing, uniform powder; color may vary by concentration . |
| CAS No. | 587-98-4 | Verified chemical registry number . |
| EINECS/EC No. | 209-608-2 | Listed in European inventory . |
| Solubility | Soluble in Water, Alcohol, DMSO; slightly soluble in Benzene, Ether | Excellent solubility profile; DMSO solubility up to 25 mg/mL . |
| Style | Anionic / Acid Dye | Suitable for application in acidic dye baths. |
| Tinting Strength | High (Absorbance E1%1cm ≥ 500 in MeOH) | Strong coloration with minimal dosage required . |
| Purity (Dye Content) | Technical Grade: ≥70-78% / High Purity: ≥98-99% (HPLC) | Multiple purity grades available for different applications . |
| Packing | 25 kg HDPE bags / 500 kg jumbo bags / 10g-1kg lab packs | Secure, moisture-proof packaging options available . |
| Melting Point | >250°C to >360°C (Decomposes) | High thermal stability for industrial processing . |
| Application | Textiles, Leather, Paper, Biological Staining, pH Indicators | Versatile across multiple industries . |
3.Product Application (Industry Usage Guide)
Textile & Leather Industry (Wool, Silk, Nylon, Leather):
Acid Yellow 36 is applied via exhaust dyeing methods at a pH of 4.0-6.0 (acetic acid). It provides brilliant, level yellow shades on protein and polyamide fibers with good migration properties. In leather finishing, it serves as a spray dye or drum dye for finished leathers and wet-blue stocks, delivering vibrant coloration with deep penetration .
Analytical Chemistry (pH Indication):
This dye serves as a reliable pH indicator in titration applications, exhibiting a sharp, reversible color change from red at pH 1.2 to yellow at pH 2.3 (or up to 3.2 depending on formulation). This makes it ideal for acid-base titrations and quality control laboratories requiring visual endpoint detection .
Biological Staining & Histology:
In microscopy applications, Metanil Yellow is utilized as:
A counterstain in Masson's trichrome to stain collagen yellow in contrast to red muscle tissue .
A stain for leukocyte granules in hematology .
A counterstain in PAS (periodic acid-Schiff)/iron-hematoxylin sections to increase contrast and visualization of cellular structures .
Research Applications:
In biochemical research, Acid Yellow 36 acts as a bifunctional inducer of specific isozymes of cytochrome P-450 and cytosolic enzymes, including glutathione-S-transferase (GST) and quinone reductase (QR). It is used to study enzyme induction mechanisms and detoxification pathways .
Paper & Industrial Colorants:
The dye is incorporated into paper pulp coloring and various industrial coating applications where its anionic nature and solubility profile provide consistent, uniform coloration.
4.Features (Why Choose Our Acid Yellow 36?)
Dual-Function Versatility: Serves both as a high-performance industrial dye AND a precision pH indicator, offering exceptional value across multiple applications – from textile coloring to analytical chemistry .
Sharp pH Transition Range: Exhibits a distinct, reversible color change from red to yellow between pH 1.2 and 2.3, providing clear visual endpoints for acid-base titrations and quality control procedures .
Multiple Purity Grades Available: We offer a range from ≥70% technical grade for industrial textile and leather applications to ≥98-99% high-purity grades for research and histological staining, ensuring optimal performance for your specific needs .
Excellent Spectral Characteristics: Maximum absorption at 414-419 nm with high extinction coefficient (≥18500), ensuring brilliant, consistent coloration and reliable analytical performance .
Proven Histological Performance: Validated for use in Masson's trichrome, leukocyte granule staining, and PAS counterstaining, with citations in peer-reviewed microscopy literature dating back decades .
Stable Formulation: Long-term stability of at least 2 years when stored at room temperature, protected from light and moisture – reducing inventory concerns and ensuring batch-to-batch consistency .
Application Flexibility: Soluble in multiple solvents (water, alcohol, DMSO) with slight solubility in organic solvents, enabling diverse formulation possibilities across industries.
5.Packaging
Usually is 25Kg/drum or paper box or bag with inner double PE liner Or provide customized packaging according to customer requirements.
6.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 certificationes, such as Reach certification.
8) Different payment methods: TT LC, etc.
9) Providing door-to-door DDP service.
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