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ACID BROWN 13.

Optional CAS 6373-79-1 / HAIR DYEING

Acid Brown 13 is an anionic direct dye used as a topical colorant for skin and hair. It imparts a brown hue without requiring an oxidative reaction.

hair dyeing colorant

Science

This direct-acting dye adsorbs onto and diffuses into keratin fibers via ionic and van der Waals interactions. Its efficacy as a skin or hair colorant relies on direct binding to proteins.


Research

Low confidence
Effective range N/A
Optimal

N/A


Transparency

Not commonly dusted

The Formula

Solubility
Water
Optimal pH 3 – 9
0 7 14

Stability

Highly stable in aqueous solutions, its deposition on keratin is pH-dependent. Optimal binding occurs at slightly acidic pH (3-5) where keratin is positively charged.

Conflicts

  • Cationic surfactants (e.g., Cetrimonium Chloride)
  • Cationic polymers (e.g., Polyquaternium-7)
  • Strong oxidizing agents

Safety

CIR Status
Not reviewed
Max tested
2%
Sensitization risk Low

While not reviewed by CIR, it is listed in the EU CosIng database. Similar acid dyes are typically restricted to 2.0% maximum in cosmetics to minimize sensitization.


Your Skin

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

Our Assessment

Optional

An optional ingredient primarily functioning as a direct colorant for skin and hair, best utilized for aesthetic purposes.


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