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Moumoujus

HC YELLOW NO. 16.

Questionable CAS 1184721-10-5 / HAIR DYEING

HC Yellow No. 16 is a non-reactive dye primarily employed for imparting yellow coloration in various hair care formulations. While its principal application lies in hair dyeing, it functions by adhering to the hair surface.

Summary

Science

Mechanism of Action

Research indicates that HC Yellow No. 16 acts as a hair coloring agent, functioning through surface adhesion. However, no specific mechanism of action or associated benefits for skin health have been identified in the available data, as its application is centered on coloring hair.

Research

Clinical Evidence

Insufficient-data confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Both
Optimal pH ≥9
0 7 14

Stability

This ingredient exhibits stability under oxidative conditions, common in many hair dye formulations. Its more polar anionic form demonstrates good aqueous solubility at pH levels at or above 9.

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
1.5%
Sensitization risk Low

The Scientific Committee on Consumer Safety (SCCS) has deemed HC Yellow No. 16 safe for use in hair dye products at concentrations up to 1% in oxidative formulations and 1.5% in non-oxidative formulations. This assessment considers recent improvements in purity, with batches exceeding 99% purity and negligible heavy metal content. It is currently 'not reviewed' by CIR.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Questionable

Given its primary role as a hair colorant and the absence of documented skincare benefits or mechanisms, its utility in precision skincare formulations is questionable.

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