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Moumoujus

CI 50420.

Optional CAS 8005-03-6 / COLORANT

CI 50420, also identified as Acid Black 2 or Nigrosin WS, is a synthetic black dye specifically employed in cosmetic formulations. Its primary function is to impart a black or dark blue/purple color to products, influencing their aesthetic presentation or applied appearance on the skin.

Summary

Cosmetic colorant

Science

Mechanism of Action

CI 50420 functions by depositing its synthetic pigment molecules onto the surface of the skin or within a cosmetic matrix. This imparts a black or dark blue/purple coloration, strictly serving an aesthetic purpose without interacting with biological pathways to confer therapeutic benefits.

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 N/A
0 7 14

Stability

Nigrosin (CI 50420) demonstrates stability under standard ambient conditions. Optimal storage involves maintaining a dry environment between +5 °C and +30 °C, ensuring containers remain tightly sealed to preserve integrity.

Conflicts

  • Strong oxidizing agents

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) generally does not assess colorants. While the Scientific Committee on Consumer Safety (SCCS) has not issued a specific opinion on CI 50420, its use in hair dye products is restricted. According to Regulation (EC) No 1272/2008, it is not classified as acutely toxic, skin corrosive/irritant, eye irritant, respiratory/skin sensitizer, germ cell mutagenic, carcinogenic, or reproductive toxicant. EWG Skin Deep indicates a low concern for cancer and allergies/immunotoxicity, a low-moderate concern for developmental/reproductive toxicity, and a moderate concern for use restrictions.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Optional

CI 50420 is an optional cosmetic colorant, providing black or dark blue/purple hues to formulations with a generally low risk profile for irritation or sensitization.

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