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Catalog Number:
42507
CAS Number:
2610-11-9
Direct red 81
Purity:
≥ 50% (Dye content)
Synonym(s):
Disodium7-benzamido-4-hydroxy-3-[[4-[(4-sulphonatophenyl)azo]phenyl]azo]naphthalene-2-sulphonate, DR 81
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Product Information

Direct Red 81 is a vibrant azo dye widely utilized in various industries, particularly in textiles, paper, and food. Known for its excellent solubility in water, this compound provides a bright red hue that is both stable and resistant to fading, making it an ideal choice for applications requiring long-lasting color. Its unique chemical structure allows for effective dyeing of cellulose and protein fibers, ensuring uniform color distribution and high color fastness. Additionally, Direct Red 81 is employed in the formulation of inks and coatings, where its vivid color enhances product appeal and visibility.

Researchers and industry professionals appreciate Direct Red 81 for its versatility and effectiveness in various applications. In the food industry, it serves as a colorant, adhering to safety regulations while providing an attractive appearance to products. Furthermore, its use in biological staining techniques aids in the visualization of cellular structures, making it a valuable tool in laboratories. With its reliable performance and broad applicability, Direct Red 81 stands out as a preferred choice for those seeking quality and consistency in their colorants.

Synonyms
Disodium7-benzamido-4-hydroxy-3-[[4-[(4-sulphonatophenyl)azo]phenyl]azo]naphthalene-2-sulphonate, DR 81
CAS Number
2610-11-9
Purity
≥ 50% (Dye content)
Molecular Formula
C29H19N5Na2O8S2
Molecular Weight
675.6
MDL Number
MFCD00003949
PubChem ID
17462
Melting Point
240 °C (dec.)
Appearance
Dark brown to red powder
Conditions
Store at RT
General Information
Synonyms
Disodium7-benzamido-4-hydroxy-3-[[4-[(4-sulphonatophenyl)azo]phenyl]azo]naphthalene-2-sulphonate, DR 81
CAS Number
2610-11-9
Purity
≥ 50% (Dye content)
Molecular Formula
C29H19N5Na2O8S2
Molecular Weight
675.6
MDL Number
MFCD00003949
PubChem ID
17462
Melting Point
240 °C (dec.)
Appearance
Dark brown to red powder
Conditions
Store at RT
Properties
Additional property information coming soon!
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Safety and Regulations
Hazmat
No
Antibiotic
No
DEA-regulated
No
Warnings
-
Applications

Direct red 81 is widely utilized in research focused on:

  • Dyeing Textiles: This chemical is commonly used in the textile industry for dyeing fabrics, providing vibrant red colors that are both appealing and durable.
  • Biological Staining: In laboratories, it serves as a vital stain for biological samples, helping researchers visualize cellular structures under a microscope.
  • Food Coloring: Direct red 81 is approved for use as a food colorant, enhancing the visual appeal of various food products while adhering to safety regulations.
  • Cosmetic Applications: The compound is also found in cosmetic formulations, where it adds color to products like lipsticks and blushes, ensuring they meet consumer expectations for aesthetics.
  • Research in Environmental Studies: It is used in environmental research to trace water pollution, helping scientists assess the impact of dyes on aquatic ecosystems.

Citations