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Moumoujus

ACID RED 184.

Optional / HAIR DYEING

Acid Red 184 is an anionic monoazo dye utilized to impart a red hue to cosmetic formulations. It functions as a direct colorant for both skin and hair applications.

Summary

colorant

Science

Mechanism of Action

This direct dye works via electrostatic attraction, adhering to positively charged proteins like keratin on the hair or skin surface. It primarily remains on the cuticle, providing temporary or semi-permanent coloring.

Research

Clinical Evidence

High confidence
Effective range 0.1–10%
Optimal

N/A

Key findings

  1. 01 US Patent 20070251025A1
  2. 02 EP 4066812 A1

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 6 – 8
0 7 14

Stability

Stable under neutral to mildly acidic conditions. Color can shift toward blue in the presence of copper or iron ions and requires storage away from direct light.

Conflicts

  • Copper ions
  • Iron ions
  • Strong oxidizing agents
  • Cationic surfactants

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
10%
Sensitization risk Unknown

While not reviewed by CIR, Acid Red 184 is an EU-permitted cosmetic colorant (CI 15685), typically used up to 10% in hair dyes and below 0.1% for skincare tinting.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Optional

As a direct colorant, Acid Red 184 is a valuable ingredient for achieving a temporary red tint in cosmetic formulations.

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