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Moumoujus

HC BLUE NO. 9.

Avoid CAS 114087-41-1 / 114087-42-2 / HAIR DYEING

HC Blue No. 9 is a direct, non-oxidative blue colorant primarily utilized for semi-permanent hair dyeing. It functions by depositing on and penetrating the hair shaft to impart color.

Summary

Hair Dyeing

Science

Mechanism of Action

This ingredient functions by directly depositing its blue pigment onto the hair shaft and subsequently penetrating it, resulting in coloration. Its mechanism is non-oxidative, meaning it does not require an oxidizing agent to develop color.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

HC Blue No. 9 is identified as a hair dye, not an ingredient typically 'dusted' into skincare formulations for minor or unproven benefits. Its primary function is a colorant for hair.

The Formula

Formulation

Solubility
Unknown
Optimal pH N/A
0 7 14

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Unknown

HC Blue No. 9 is no longer permitted as a hair dye ingredient within the European Union, a directive that came into effect in August 2007. There is no available safety data regarding its use on skin.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

HC Blue No. 9 is a hair dye with no reported benefits for skin and has been prohibited for use as a hair dye in the EU, rendering it unsuitable for precision skincare formulations.

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