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CI 77510.

Valuable CAS 12240-15-2 / 25869-00-5 / COLORANT

CI 77510, also identified as Ferric Ferrocyanide, is an inorganic blue pigment widely used in cosmetics. It imparts a distinctive blue color to products by interacting with light, and it is notable for not penetrating the skin.

Summary

Cosmetic Colorant

Science

Mechanism of Action

This ingredient functions as an inorganic pigment, creating a blue coloration in cosmetic products through the physical absorption or reflection of light. Its action is surface-level, as it does not permeate the skin's barrier.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Both
Optimal pH 3 – 7
0 7 14

Stability

CI 77510 (Ferric Ferrocyanide) exhibits excellent stability across various environmental factors, including light, heat, weathering, and chemical exposure, ensuring enduring color performance. While it is intrinsically insoluble in water and organic solvents, it can be effectively dispersed in both water-based and oil-based formulations. Optimal stability is maintained within a pH range of 3.0 to 7.0, with its aqueous suspension typically showing a neutral to slightly acidic pH between 5.0 and 7.0. Exposure to strong acids or alkalis may lead to decomposition or color alteration.

Conflicts

  • Strong acids
  • Strong alkalis

Safety

Safety Profile

CIR Status
Deferred evaluation
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has deferred evaluation of CI 77510, citing prior safety assessments by the FDA. The FDA authorizes CI 77510 as a color additive, exempt from certification, for use in externally applied cosmetics (including products for the eye area) and externally applied drugs, provided it meets FDA specifications. Specifically, the FDA mandates strict limits for soluble cyanide, permitting no more than 10 parts per million (ppm) in Ferric Ferrocyanide and Ferric Ammonium Ferrocyanide. In the US, it is not permitted for use in products intended for application on the lips. In the European Union, CI 77510 is approved for use in all cosmetics and personal care products under Annex IV, Part I of the Cosmetics Directive (Regulation (EC) No. 1223/2009), with the critical condition that it must be free from cyanide ions.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

CI 77510 is a valuable, stable inorganic blue pigment widely used in cosmetics, generally well-tolerated across all skin types, with safety assured by regulatory bodies under strict purity specifications.

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