cosmetic dye Acid Red 94 powder Raw Materials CAS 632-69-9

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Product details

Uses and synthesis of Acid Red 94 powder

Acid Red 94 powder, also known as Bengal rose red, a chemical with a molecular weight of 1017.64. Acid Red 94 is a purplish-red to reddish-brown particle or powder. No odor. Soluble in water (30g/100ml) and ethanol, difficult to dissolve in water with high hardness. Soluble in glycerol and glycol. Insoluble in oil and ether. The pH value of 1% aqueous solution is 6.5 ~ 10, and it is blue red. Light resistance, weak acid resistance. Acid Red 94 is mainly used for the treatment of anti-tumor and antiviral syndromes.

Functions of Acid Red 94 powder

• Acid Red 94 powder is mainly used for the treatment of anti-tumor and antiviral syndromes.
• Edible red pigment. Acid Red 94 is used for cherry, fish cake, kelp fish roll, sausage, cake, fish pine, etc., the dosage is 5 ~ 100mg/kg.
• Acid Red 94 is used as adsorption indicator and cell stain
• Bacterial stain; Adsorption indicator for silver titration
• 

Applications of Acid Red 94 powder

1. Cosmetics Industry  
Lipstick/Lip Gloss: Usage 0.1–0.5% (provides long-lasting color)  

Blush/Eyeshadow: Used in combination with inorganic pigments  

Nail Polish: Requires use with a nitrocellulose system  

2. Pharmaceutical Coloring  
Topical Formulations: Ointments, Washes (compliant with USP <631> standards)

Oral Care: Mouthwash (maximum usage ≤0.001%)  

3. Special Applications  
Biological Staining: Pre-treatment of microscope samples  

Indicators: Acid-base titration (color change at pH 4.2–6.3)

Physicochemical Property of Acid Red 94 powder

Acid Red 94 powder is purplish red to reddish-brown particles or powder. No odor. Soluble in water (30g/100ml) and ethanol, difficult to dissolve in water with high hardness. Soluble in glycerol and glycol. Insoluble in oil and ether. The pH value of 1% aqueous solution is 6.5 ~ 10, and it is blue red. Light resistance, weak acid resistance.

Production methodprocess of Acid Red 94 powder

Acid Red 94 is obtained from tetrachlorofluorescein iodized and salted out with sodium chloride

FAQ.

Q1: What is the difference between Acid Red 52 and Acid Red 94?  
▶ Structural differences: AR94 contains more sulfonic acid groups and has better water solubility.  

▶ Regulatory status: AR52 is banned in the EU, while AR94 remains available.  

Q2: How can the content of Acid Red 94 in a product be detected?  
▶ HPLC method: USP<631> Method B

▶ Spectrophotometric method: Calibration curve at 530 nm

Q3: How to address uneven dyeing?
▶ Solutions:

Pre-dissolve in a small amount of ethanol (1:5)

Increase stirring temperature to 40–45°C

Add 0.1% polysorbate 80

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