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Moumoujus

ACID YELLOW 1.

Optional CAS 846-70-8 / HAIR DYEING

Acid Yellow 1 (CI 10316) is a synthetic nitro dye primarily used as a cosmetic colorant. It imparts a yellow hue to formulations through surface deposition, without chemical reaction.

Summary

colorant

Science

Mechanism of Action

This synthetic nitro dye works by absorbing specific light wavelengths to impart a yellow color to cosmetic formulations. It functions via surface deposition on the hair shaft or other surfaces.

Research

Clinical Evidence

High confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 An in vitro MTT assay indicated 93% cell viability at a 2% concentration, suggesting non-irritancy at the intended use of 1.0% in hair formulations.
  2. 02 A Guinea pig maximization test concluded the substance is not a skin irritant, even at concentrations up to 10%.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 6.2 – 7.75
0 7 14

Stability

Stable for at least 7 days in 1% CMC aqueous solutions, with long-term stability in dry and dark conditions.

Conflicts

  • strong oxidizing agents
  • strong reducing agents
  • sodium hydroxide (may cause flocculation)
  • ferric chloride (causes color shift to yellow-brown)

Safety

Safety Profile

CIR Status
Safe as used
Max tested
1%
Sensitization risk Low

The FDA restricts its use to external applications only (Ext. D&C Yellow No. 7) and prohibits use in the eye area. It is safe for oxidative hair dyes up to 1.0% and non-oxidative dyes up to 0.2%.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Optional

Acid Yellow 1 is a safe, low-irritancy colorant suitable for a variety of external cosmetic applications, enhancing product aesthetics.

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