Acid Red 88
[CAS# 1658-56-6]

Identification

• Classification: Dyes and pigments >> Dyes >> Acid dyestuff
• Name: Acid Red 88
• Synonyms: Sodium 4(-2-hydroxy-1-naphthylazo)naphthalenesulphonate
• Molecular Formula: C₂₀H₁₃N₂O₄S.Na
• Molecular Weight: 400.38
• CAS Registry Number: 1658-56-6
• EC Number: 216-760-3
• SMILES: C1=CC=C2C(=C1)C=CC(=C2N=NC3=CC=C(C4=CC=CC=C43)S(=O)(=O)[O-])O.[Na+]

Safety Data

• Hazard Symbols: GHS07 Warning
• Risk Statements: H319
• Safety Statements: P264+P265-P280-P305+P351+P338-P337+P317

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Eye irritation	Eye Irrit.	2	H319
Chronic hazardous to the aquatic environment	Aquatic Chronic	3	H412
Skin irritation	Skin Irrit.	2	H315

Discovery and Applications

Acid Red 88 is a synthetic dye first developed in the early 20th century and is widely used in various industries due to its vibrant red color and functional properties. It belongs to the class of azo dyes, characterized by the presence of one or more azo groups (-N=N-) that contribute to its intense coloration.

The primary application of Acid Red 88 is in the textile industry, where it is used as a dye for wool, silk, and nylon fabrics. Its ability to produce bright and durable red hues makes it a popular choice for coloring textiles. The dye's excellent fastness properties ensure that the color remains stable and resistant to fading even after repeated washing and exposure to light. This makes Acid Red 88 suitable for use in both high-end fashion and everyday garments, providing a long-lasting aesthetic appeal.

In addition to textiles, Acid Red 88 finds applications in the food industry. It is used as a colorant in various food products, contributing to their visual appeal and consumer acceptance. The dye is included in formulations for beverages, candies, and processed foods, where it enhances the attractiveness of the products. Its use in food is regulated to ensure safety and compliance with health standards, with maximum allowable concentrations set by regulatory agencies.

Acid Red 88 is also employed in the pharmaceutical and cosmetic industries. In pharmaceuticals, it is used as a colorant in tablets and capsules, aiding in product identification and differentiation. In cosmetics, the dye is incorporated into various products such as lipsticks and creams, where it provides a vibrant red color that enhances the product's appeal.

Despite its broad range of applications, Acid Red 88, like other synthetic dyes, requires careful handling and regulation due to potential environmental and health concerns. Efforts are ongoing to monitor its safety and explore alternatives that minimize potential risks.

References

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