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Moumoujus

ACID RED 35.

Avoid CAS 6441-93-6 / HAIR DYEING

Acid Red 35 is an anionic azo dye primarily utilized as a temporary or semi-permanent colorant in hair dyes. It finds further application in textile dyeing and biological staining.

Summary

colorant

Science

Mechanism of Action

This anionic azo dye functions by electrostatic interaction between its negatively charged sulfonic acid groups and positively charged amino groups found in proteins like keratin. It binds to the hair surface and cortex to impart color.

Research

Clinical Evidence

Insufficient-data confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 2 – 4
0 7 14

Stability

Acid Red 35 demonstrates optimal stability and substantivity under acidic conditions (pH 2-4) and exhibits good lightfastness. It is unstable in strongly reductive environments.

Conflicts

  • Reducing agents
  • Strongly alkaline environments
  • Cationic surfactants
  • Laccase enzymes

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
0.03%
Sensitization risk High

Classified as a strong skin sensitizer, Acid Red 35 is restricted or banned in regions like the EU and Australia. This is due to its potential reductive cleavage to o-toluidine, a Category 1B carcinogen. NICNAS suggests a 0.03% limit for general cosmetics.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

Due to its classification as a strong skin sensitizer and the potential to form a Category 1B carcinogen, this ingredient is not suitable for precision skincare formulations.

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