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Moumoujus

ACID YELLOW 73 SODIUM SALT.

Optional CAS 518-47-8 / HAIR DYEING

Acid Yellow 73 Sodium Salt, also known as Fluorescein Sodium, is a xanthene dye used as a cosmetic colorant. It provides a temporary yellow-green tint to formulations or the skin.

Summary

colorant

Science

Mechanism of Action

This ingredient selectively absorbs blue light (465-490 nm) and emits a yellow-green fluorescence (520-530 nm). Its color and fluorescence are pH-dependent, appearing green in alkaline conditions.

Research

Clinical Evidence

Insufficient-data confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 7 – 9
0 7 14

Stability

Stable in alkaline conditions (pH 7.0-9.0), with optimal fluorescence. It is light-sensitive and requires UV stabilizers to prevent fading.

Conflicts

  • Acidic environments
  • Strong oxidizing agents
  • UV light

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
6%
Sensitization risk Low

Regulated by EU Annex IV and ASEAN Cosmetic Directive at max 6%. Prohibited in EU hair dyes. Low contact dermatitis risk at 1%; however, 2% intradermal tests showed 6% irritation, and undiluted material is a strong irritant.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Optional

A cosmetic colorant imparting yellow-green fluorescence, generally well-tolerated at regulated concentrations but requires careful formulation for stability.

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