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ACID ORANGE 24.

Avoid CAS 1320-07-6 / 6371-84-2 / HAIR DYEING

Acid Orange 24 (CI 20170), also known as Resorcin Brown, is a synthetic disazo acidic dye. Its primary function is as a colorant, but it is notably restricted or banned in various cosmetic applications due to safety concerns.

colorant

Science

This disazo dye imparts color by depositing onto skin keratin through ionic bonding. It lacks biological activity on skin cells but has the potential for reductive cleavage, forming aromatic amines with toxicological implications.


Research

Low confidence
Effective range N/A
Optimal

N/A


Transparency

Not commonly dusted

The Formula

Solubility
Water
Optimal pH 1 – 11
0 7 14

Stability

Expected to be stable across a wide pH range (1-11), dissolving in water and ethanol to yield yellow-brown to orange-red shades.

Conflicts

  • Strong oxidizing agents
  • Strong reducing agents
  • Strongly acidic conditions < pH 1.0

Safety

CIR Status
Not reviewed
Max tested
0.5%
Sensitization risk Moderate

Restricted or banned in multiple regions for cosmetic use, including a ban in the EU for hair dyes, due to the potential release of carcinogenic metabolites such as 2,4-dimethylbenzenamine (xylidine).


Your Skin

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

Our Assessment

Avoid

This ingredient is unsuitable for precision skincare due to its potential to form carcinogenic metabolites and its restricted status in numerous jurisdictions.


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