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Moumoujus

ACID RED 27.

Avoid CAS 915-67-3 / HAIR DYEING

ACID RED 27, also known as Amaranth or CI 16185, is a synthetic monoazo dye. It is primarily utilized in cosmetic formulations to impart a reddish-brown or bluish-red aesthetic hue.

Summary

colorant

Science

Mechanism of Action

This ingredient functions solely as a physical aesthetic additive. It absorbs and reflects light at approximately 520 nm to provide color, offering no therapeutic or biological mechanisms of action for skin health or function.

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 3 – 10
0 7 14

Stability

Highly stable to light and heat, this anionic dye maintains optimal stability within slightly acidic to neutral pH ranges, typical for cosmetic products.

Conflicts

  • Strong oxidizing agents
  • Strong reducing agents
  • Cationic surfactants
  • Strong acids

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
0.2%
Sensitization risk Low

While permitted in some regions (e.g., EU as CI 16185 at ≤0.2%), the FDA banned its use in US cosmetics in 1976 due to carcinogenicity concerns. Its safety evaluation is largely deferred to international regulatory bodies.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

Despite its coloring properties, ACID RED 27 is an ingredient to avoid for precision skincare due to its lack of therapeutic benefits and historical ban in the US over safety concerns.

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