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Moumoujus

2-HYDROXYETHYL PICRAMIC ACID.

Questionable CAS 99610-72-7 / HAIR DYEING

A nitroaromatic compound specifically engineered for hair coloration systems, functioning as a direct-acting dye that deposits color molecules into the hair cortex. While primarily used in hair dye formulations, this ingredient shows controlled safety parameters with established regulatory approval. Its mechanism involves direct pigment deposition without requiring oxidative reactions with natural hair melanin.

Summary

Hair dyeing Color deposition

Science

Mechanism of Action

Penetrates the hair shaft and deposits color molecules directly into the cortex through a non-oxidative pathway, though can also function in oxidative systems to produce red and brown color variations

Research

Clinical Evidence

High confidence
Effective range 0.1–2%
Optimal

1.5%

Key findings

  1. 01 SCCS evaluation at 2.0% in non-oxidative hair systems showed safety profile excluding sensitization concerns
  2. 02 1.5% concentration assessment in oxidative formulations with hydrogen peroxide demonstrated acceptable safety margins
  3. 03 Reproductive safety study at 0.1% topical application during rat gestation showed no embryonic or teratogenic effects

Transparency

Dusting Analysis

Not commonly dusted

Specialized hair dye ingredient with established maximum safe concentrations; not typically subject to cosmetic dusting practices due to specific colorant function

The Formula

Formulation

Solubility
Water
Optimal pH 3.6 – 7
0 7 14

Stability

Maintains stability in aqueous solutions with natural pH around 3.6; thermal decomposition begins above 141°C; secondary amine structure requires careful formulation to prevent nitrosamine formation

Conflicts

  • Nitrosating agents
  • Strong oxidizing agents outside intended hair dye applications

Safety

Safety Profile

CIR Status
Safe as used
Max tested
2%
Pregnancy
Safe
Sensitization risk High

Classified as skin sensitizer requiring patch testing; reproductive toxicity noted only at extremely high oral doses (450 mg/kg/day) with minimal dermal absorption; safe concentrations vary by application type

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Questionable

While effective for hair coloration with established safety parameters, the high sensitization risk and specialized application scope limit its broader skincare utility.

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