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Moumoujus

CI 16255.

Optional CAS 2611-82-7 / COLORANT, HAIR DYEING

CI 16255, also known as Ponceau 4R or Acid Red 18, is a synthetic red azo dye. It functions as a cosmetic colorant, imparting a vibrant red hue to products, skin, nails, and hair.

Summary

colorant hair dyeing

Science

Mechanism of Action

As a large molecule, CI 16255 does not penetrate the skin or scalp. Therefore, it exerts no biological mechanism of action or therapeutic effects on the skin itself.

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 4 – 7
0 7 14

Stability

CI 16255 shows good resistance to light, heat, and acids, but requires protection from direct light and humidity. Adequate preservation is necessary due to its poor resistance to bacteria.

Conflicts

  • Alkaline solutions (causes browning)
  • Ascorbic acid (causes fading)

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
0.5%
Sensitization risk Low

Approved in the EU for all cosmetic products, with a 0.5% maximum for hair dye formulations. While generally safe for topical use, it is not FDA approved for human consumption and may trigger intolerance in individuals allergic to salicylates due to its azo dye nature.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Optional

CI 16255 serves as an effective red cosmetic colorant, providing visual appeal without biological interaction with the skin due to its non-penetrating nature.

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