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PIGMENT BLUE 27.

Valuable CAS 12240-15-2 / COLORANT

PIGMENT BLUE 27, also known as Ferric Ferrocyanide or Prussian Blue, is an inorganic pigment engineered to impart an intense, dark blue color to cosmetic products. Its stability and non-penetrating nature make it a valuable colorant, though specific formulation considerations are crucial.

Summary

Cosmetic Colorant

Science

Mechanism of Action

As an inorganic pigment, PIGMENT BLUE 27 functions by absorbing and reflecting light wavelengths, thereby delivering a distinct, dark blue coloration to cosmetic formulations. It acts purely as an aesthetic enhancer, providing no direct biological activity on the skin.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

Information regarding dusting properties for PIGMENT BLUE 27 is not available in the provided research data.

The Formula

Formulation

Solubility
Unknown
Optimal pH 5 – 8
0 7 14

Stability

This pigment is stable across a pH range of 5.0 to 8.0; however, even dilute alkaline environments can cause decomposition. It exhibits good resistance to light and dilute acids but degrades when boiled with concentrated sulfuric acid. Thermally, it remains stable up to 140 °C, though crystal water is lost at 170-180 °C, and combustion occurs at 200-220 °C, releasing hydrogen cyanide acid. PIGMENT BLUE 27 is insoluble in water, ethanol, ether, and oils, requiring dispersion in oily mediums or isopropyl alcohol for incorporation into water-based formulations.

Conflicts

  • Alkaline environments (including weak alkali)
  • Basic pigments
  • Lead white
  • Calcium carbonate
  • Polyvinyl chloride (PVC)
  • Strong oxidizing agents

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Low

PIGMENT BLUE 27 (Ferric ferrocyanide, CI 77510) is an FDA-approved color additive for externally applied cosmetics, including eye area products, when used in accordance with good manufacturing practices. It is not permitted in US lip products. In the EU, it is approved for all cosmetic and personal care products provided it is free from cyanide ions. It is considered safe and non-toxic, as it does not penetrate the skin.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

PIGMENT BLUE 27 is a valuable cosmetic colorant, offering a stable and intense blue hue with a low risk of irritation and comedogenicity for a wide range of skin types and applications, provided formulation stability requirements are met.

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