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ACID BLUE 74 ALUMINUM LAKE.

Optional CAS 16521-38-3 / HAIR DYEING

An insoluble blue pigment derived from indigo carmine, widely utilized in cosmetics to impart vivid coloration. It adheres topically to skin and hair surfaces without cellular absorption.

colorant

Science

Functions as a physical colorant by absorbing wavelengths around 610nm and reflecting blue light. Its aluminum lake form ensures physical dispersion rather than chemical reaction on the skin.


Research

Low confidence
Effective range N/A
Optimal

N/A


Transparency

Commonly dusted

Inhalation risk is noted when Acid Blue 74 Aluminum Lake is used in aerosolized or powder forms.


The Formula

Solubility
Water
Optimal pH 6 – 7
0 7 14

Stability

Most stable in the pH range of 6-7, where color intensity is optimal. It is light-sensitive and can decolorize under UV exposure or high pH (>6.8) without photostabilizers.

Conflicts

  • Strong oxidizing agents
  • Strong acids
  • Polyethylene glycol (PEG)

Safety

CIR Status
Safe as used
Sensitization risk Low

FDA approved for use in food, drugs, and cosmetics, including the eye area. SCCS and CIR deem it safe due to minimal dermal absorption, though high oral doses in rats showed increased brain gliomas.


Your Skin

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Optional

A widely approved blue pigment primarily for cosmetic coloration, exhibiting low irritancy and broad skin compatibility.


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