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CI 42051 (Patent Blue V)
The Brilliant Cosmetic Blue
What is CI 42051? Behind this cryptic code (Colour Index) lies the synthetic dye Patent Blue V, also known as Acid Blue 3. It is a triphenylmethane dye that is also approved as a food coloring (E131). In cosmetics, it is valued for giving products an intense, brilliant blue color.
🎨 Color Intensity & Mixability
This dye is a true artist in formulation.
- High Coloring Power: Even the smallest amounts of the powder are sufficient to achieve strong coloration. It is very economical.
- Water-Soluble: It dissolves excellently in water, making it ideal for shower gels, shampoos, bath additives, or mouthwashes.
- Mixing Artist: In combination with yellow dyes (like Tartrazine), beautiful, bright green tones can be created; mixing with red results in purple tones.
💡 Function in the Product
CI 42051 has no caring effect on the skin. Its sole function is aesthetics. It helps to make the product visually appealing or to visually underline a specific scent direction (e.g., "ocean breeze" or "ice candy"). It is stable against light and various pH values.
⚠ What you should watch out for
Synthetic Origin: This is a purely synthetic dye and not suitable for certified natural cosmetics, which rely on natural pigments. It is generally considered safe for cosmetic application. Extremely rare allergic reactions are mostly known only in a medical context (with injections), not with topical application.