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Moumoujus

ACID ORANGE 6.

Optional CAS 547-57-9 / HAIR DYEING

Acid Orange 6 is a synthetic monoazo dye imparting a yellow-to-orange hue to cosmetic formulations. Primarily functioning as a colorant, it is widely used in externally applied products.

Summary

colorant

Science

Mechanism of Action

This ingredient acts as a non-reactive surface dye, absorbing visible light at approximately 430-450 nm to provide color. It does not exhibit significant biological activity or deep skin penetration.

Research

Clinical Evidence

Low confidence
Effective range 0.5–2%
Optimal

N/A

Key findings

  1. 01 Evaluated for its colorant role, studies indicate low acute toxicity (LD50 > 10,000 mg/kg in rats).

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 3 – 7
0 7 14

Stability

Highly stable in aqueous solutions, though sensitive to very high alkaline pH (>11.0), UV exposure, and certain reducing agents.

Conflicts

  • Oxidizing agents
  • Strong reducing agents
  • Specific metallic ions (e.g., Osmium)

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
2%
Sensitization risk Low

Allowed in EU and South Africa for all cosmetics, restricted to externally applied products in the US. Forbidden for use in hair dye products across multiple jurisdictions.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Optional

Acid Orange 6 is a safe and effective cosmetic colorant for externally applied products, with low irritancy and no significant skin benefits beyond aesthetic enhancement.

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