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BROMPHENOL BLUE.

Insufficient Data CAS 115-39-9 / ANTIMICROBIAL, ANTIOXIDANT

A sulfonated hydroxyquinone dye that functions as both a pH indicator and colorant in cosmetic formulations. This synthetic compound transitions from yellow to blue-purple across acidic pH ranges and forms complexes with protein structures for visualization purposes.

colorant pH indicator

Science

Forms stable, negatively charged complexes with basic amino acid residues in proteins, particularly arginine and aromatic amino acids, allowing for selective binding to skin proteins and membranes while functioning as a pH-sensitive indicator dye.


Research

Medium confidence
Effective range 0.05–0.2%
Optimal

0.05%

Key findings

  1. 01 Ophthalmic safety study at 0.2% showed no toxicity or tissue abnormalities in porcine eyes
  2. 02 Cell culture studies at 0.05% demonstrated no inhibition of cell proliferation or toxic effects on retinal epithelium

Transparency

Not commonly dusted

Primarily used as a specialized colorant and pH indicator rather than an active skincare ingredient, making dusting practices irrelevant for this compound.


The Formula

Solubility
Water
Optimal pH 3 – 4.6
0 7 14

Stability

Stable in aqueous and alcoholic solutions under normal conditions but exhibits concentration-dependent color changes and sensitivity to oxidation-reduction environments.

Conflicts

  • strong oxidizing agents
  • cationic surfactants
  • strong reducing agents

Safety

CIR Status
Not reviewed
Max tested
0.2%
Sensitization risk Unknown

Related compound Tetrabromophenol Blue approved by SCCS for hair dye use at 0.2% maximum concentration on scalp.


Your Skin

No Normal
No Dry
No Oily
No Sensitive
Irritancy Unknown
Comedogenicity Unknown

Our Assessment

Insufficient Data

Limited skincare-specific research despite established safety profile in related applications.


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