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Moumoujus

ACID BLACK 131.

Avoid CAS 12219-01-1 / HAIR DYEING

Acid Black 131 is a synthetic azo dye primarily used as a colorant. This large molecule does not penetrate the skin barrier but provides temporary surface pigmentation.

Summary

colorant

Science

Mechanism of Action

It functions by ionic bonding, where negatively charged dye molecules adhere to positively charged keratin fibers or textiles. This surface adherence provides temporary coloration without deep penetration.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 6 – 8
0 7 14

Stability

Highly soluble in aqueous solutions, this dye shows optimal stability between pH 6.0 and 8.0. It is sensitive to strong acid hydrolysis.

Conflicts

  • Cationic surfactants
  • Strong oxidizing agents
  • Reducing agents
  • Strong acids

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Low

Acid Black 131 is largely banned or restricted in cosmetic use globally. This is due to its potential to release carcinogenic aromatic amines, such as o-Anisidine, upon reductive cleavage.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

Due to its documented potential to release carcinogenic aromatic amines and its global cosmetic restrictions, Acid Black 131 is strictly prohibited for skincare applications.

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