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Moumoujus

CI 61570.

Optional CAS 4403-90-1 / COLORANT

CI 61570, recognized also as Acid Green 25 or D&C Green No. 5, is a synthetic colorant that imparts a distinct bluish-green hue to cosmetic formulations. Its primary function is aesthetic, achieved by the absorption or reflection of physical light. It is widely incorporated across various personal care products, including skincare, makeup, and hair colorants.

Summary

Cosmetic colorant

Science

Mechanism of Action

This synthetic ingredient functions purely as a cosmetic colorant. It absorbs and reflects specific wavelengths of physical light, visually transforming products to display a bluish-green coloration without exerting any direct biochemical effect on the skin.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 At 0.3%, dermal absorption studies were conducted, aligning with a proposed maximum on-head concentration for semi-permanent hair dyes.
  2. 02 No skin irritating effects were observed in guinea pigs at 10% concentration under occlusive conditions over 24 hours.
  3. 03 A very mild, transient irritation, resolving within 48 hours, was noted in guinea pigs at 15% concentration.
  4. 04 High concentrations, such as 50%, caused significant skin staining that complicated the objective evaluation of erythema, though no oedema was reported.

Transparency

Dusting Analysis

Not commonly dusted

As a cosmetic colorant, CI 61570's role is purely aesthetic and does not involve active claims that typically lead to 'dusting' in ingredient marketing.

The Formula

Formulation

Solubility
Water
Optimal pH 4 – 7
0 7 14

Stability

Optimal color development and stability for CI 61570 are observed under acidic conditions, with a suggested optimal pH range of 4-7. In alkaline environments, the ingredient may undergo hydrolysis or precipitation, potentially leading to a reduction in color intensity and stability.

Conflicts

  • strong oxidizing agents

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Low

The Scientific Committee on Consumer Safety (SCCS) initially found data insufficient in 2005 but later concluded that CI 61570 is not a skin sensitizer under compromised skin barrier conditions. The ingredient is FDA-approved as D&C Green No. 5 and is permanently listed for use in drugs and cosmetics, including the eye area, subject to specific limitations and certification. In the EU, it is permitted under Annex IV of the Cosmetics Regulation with defined maximum concentrations and applications. While generally well-tolerated at typical cosmetic concentrations, high concentrations can pose a risk of irritation and redness, particularly for individuals with sensitive skin or allergies. Patch testing is recommended for sensitive individuals prior to full usage. A proposed maximum on-head concentration for semi-permanent hair dyes is 0.3%, while for nylon sutures, it is 0.6%.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Optional

CI 61570 is a well-regulated synthetic colorant primarily valued for its aesthetic contribution, offering a distinct bluish-green hue with a generally low risk of irritation at concentrations typical for cosmetic applications.

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