CI 77510
Ferric Ferrocyanide (Prussian Blue; Iron Blue)
Prussian Blue is chemically stable and insoluble. EU Annex IV prohibits use in eye area products. In acidic conditions cyanide ions could theoretically release but at cosmetic use levels this is not a practical safety concern.
Function & Common Use
Colorant; Pigment
Colorants & Pigments
Nail polish, eyeshadows (non-EU eye area), hair color
Inorganic
Concentration Limits
As per Schedule III
As per Annex IV; not for eye area
qs
None specified
Format restriction: Not for use in eye area products (EU Annex IV restriction); external use only
Baby restriction: No
Pregnancy: No
IFRA: No
Frequently Asked Questions
Is CI 77510 safe to use in skincare?
CI 77510 has a Low concern rating from The Clean Sheet. Prussian Blue is chemically stable and insoluble. EU Annex IV prohibits use in eye area products. In acidic conditions cyanide ions could theoretically release but at cosmetic use levels this is not a practical safety concern.
Is CI 77510 allowed in India?
CI 77510 is currently classified as "Permitted" under Indian cosmetics regulations. The maximum permitted concentration is As per Schedule III.
What is CI 77510 used for in cosmetics?
CI 77510 functions as: Colorant; Pigment. It is commonly found in: Nail polish, eyeshadows (non-EU eye area), hair color.
Can CI 77510 cause an allergic reaction?
Yes. CI 77510 has an allergen flag (No). If you have sensitive skin or known fragrance/contact allergies, patch-test products containing this ingredient before full use.
Is CI 77510 safe for babies?
CI 77510 has baby/child restrictions: No. Avoid using products containing this ingredient on infants unless specifically formulated and labelled for baby use.
Regulatory Status
EU Annex: Annex IV (colorant)
Identifiers
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