Acid Red 92 (Phloxine B) High Purity
Catalog No: ASD-631
CAS No: 18472-87-2
Color Index: C.I. 45410
Grade: Cosmetic Grade / D&C Red No. 28 / Analytical Reagent Grade
Product Overview
Acid Red 92, widely recognized as Phloxine B or D&C Red No. 28, is a premium water-soluble xanthene dye. This specific batch (ASD-631) is characterized by exceptional quality, boasting a purity level of 90.70%, which significantly exceeds standard industry specifications.
Known for its vibrant magenta to bluish-red fluorescence, this dye is a top choice for cosmetic formulations—specifically bath bombs and soaps—due to its superior stability in alkaline environments. It is also a critical staining agent in histology and microbiology laboratories.
Key Features & Benefits
- Ultra-High Purity: Verified assay of 90.70% (Spec >85%), ensuring intense coloration with less product dosage required.
- Low Impurities: Contains extremely low volatile matter and salts (3.70%), providing more active dye content per gram than standard market alternatives.
- Excellent Solubility: Water-insoluble matter is minimal (0.15%), ensuring clear solutions without sedimentation.
- Safety Compliance: Rigorously tested for heavy metals (Lead, Mercury, Arsenic) to ensure safety for cosmetic and external pharmaceutical applications.
Applications
💄 Cosmetics & Personal Care (D&C Red 28)
- Bath Bombs: The industry standard for vibrant pinks; does not fade easily and offers a "bloom" in water.
- Soaps: Highly stable in high-pH products like Cold Process (CP) soap.
- Skin & Hair: Used in lotions, shampoos, and conditioners.
🔬 Laboratory & Diagnostics
- Histology: Used as a cytoplasmic counterstain (Phloxine-Eosin).
- Microbiology: Employed in media for specific bacterial counts.
- Dental: Used in plaque disclosing agents.
Certificate of Analysis (CoA)
Batch Analysis Report No. 050725
| Sr. No. | Criteria | Specification / Limit | Batch Result | Status |
|---|---|---|---|---|
| 1 | Purity (Assay) | Min. > 85.0% | 90.70% | ✅ Pass |
| 2 | Sum of Volatile Matter & Chlorides/Sulfates (Calc. as Sodium Salt) | Max. < 15.0% | 3.70% | ✅ Pass |
| 3 | Water Insoluble Matter (Alkaline Solution) | Max. < 0.5% | 0.15% | ✅ Pass |
| 4 | Lead (Pb) | Max. < 20 PPM | < 20 PPM | ✅ Pass |
| 5 | Mercury (Hg) | Max. < 1 PPM | < 1 PPM | ✅ Pass |
| 6 | Arsenic (As) | Max. < 3 PPM | < 3 PPM | ✅ Pass |
Regulatory Information
- USA: Certified as D&C Red No. 28. Permitted for use in Drugs and Cosmetics (21 CFR 74.1328). Not permitted for food.
- EU: Permitted in Cosmetics (CI 45410).
- Safety: Do not ingest. For external and laboratory use only.
Storage
Store in a tightly closed container in a cool, dry place. Protect from direct sunlight and moisture to ensure shelf-life stability.
