Description

Acid Red 51 is a synthetic, water-soluble xanthene dye known for its brilliant red color and high tinctorial strength. This product is essential for applications requiring a stable and vivid red hue with good light and pH stability. It is primarily used by manufacturers in the cosmetics, personal care, and pharmaceutical industries, as well as in specialized biological staining protocols.

Application

• Cosmetic and Personal Care Products: Used as a colorant in lipsticks, blushes, nail polishes, soaps, and bath products.
• Pharmaceuticals: Employed as a coloring agent in tablets, capsules, and topical ointments.
• Biological Staining: Functions as a vital stain in microscopy, particularly for specific cellular components.
• Industrial Inks and Dyes: Suitable for coloring inks, paper, and specialty coatings where a non-toxic red dye is required.
• Food Contact Materials: Can be used to color packaging materials and other non-food items where indirect contact is possible (subject to regional regulations).
• Educational and Laboratory Reagents: Serves as a demonstrative dye in chemical and biological experiments.

Basic Information

Product Name	Acid Red 51
CAS No.	568-63-8
Molecular Formula	C₂₂H₂₀N₂O₅S₂
Molecular Weight	456.53 g/mol
Synonyms	Eosin Y; Eosin Yellowish; Bromoeosin; Acid Red 87; C.I. 45380; 2',4',5',7'-Tetrabromofluorescein; Tetrabromofluorescein; Eosin Y, water soluble
EINECS	209-277-8

Quality Control

Our Acid Red 51 is manufactured under a strict quality management system. Each batch is tested to ensure it meets specifications for identity, purity, and color strength, with compliance to relevant standards such as D&C Red No. 22 and Cosmetic Grade requirements where applicable. A comprehensive Certificate of Analysis (COA) is provided with every shipment to guarantee traceability and consistency.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product performance.

Specification

Item	Specification
Appearance	Red to reddish-brown powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 85.0%
Loss on Drying	≤ 10.0 %
Residue on Ignition (Sulfated Ash)	≤ 1.0 %
Heavy Metals (as Pb)	≤ 20 ppm
Water Solubility	Freely soluble
Color Strength & Shade	Within agreed tolerances vs. standard

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.