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CI 42735.

Insufficient Data CAS 6505-30-2 / COLORANT

CI 42735, also recognized as Acid Blue 104, is a synthetic blue triphenylmethane dye. Its primary function is to impart a distinct blue coloration to cosmetic products, as well as to skin, nails, and hair.

Summary

Colorant

Science

Mechanism of Action

CI 42735 acts as a synthetic chromophore, delivering a blue hue through its inherent molecular structure. When integrated into cosmetic formulations or applied topically, it optically modifies the product or target substrate by absorbing certain wavelengths of light and reflecting others, specifically in the blue spectrum.

Research

Clinical Evidence

Insufficient-data 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

This colorant is readily soluble in both water and ethanol, producing a violet-blue solution. However, exposure to strong sulfuric acid causes a significant chromatic shift, altering its color from yellow to golden brown, which further dilutes to lemon yellow. The presence of copper or iron ions can also induce a darker coloration. Due to potential sensitivities, its inclusion in products intended for application on or in the immediate vicinity of mucous membranes, such as the lip and eye areas, is not advised.

Conflicts

  • strong acids (induce color change)
  • copper ions (cause darker color)
  • iron ions (cause darker color)

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Unknown

The Cosmetic Ingredient Review (CIR) Expert Panel has not conducted a specific safety assessment for CI 42735, leaving comprehensive toxicological profiles and maximum safe concentrations undetermined. Furthermore, its restricted use from products applied to mucous membranes suggests potential localized irritation or adverse reactions in these sensitive areas.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Insufficient Data

While CI 42735 effectively delivers a blue color, the absence of a comprehensive safety assessment by the CIR and specific data on skin compatibility significantly limits its utility within precision skincare formulations.

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