Based on its formula, is No. 4P Blonde Enhancer Toning Shampoo safe for sensitive or dry hair?

The presence of a sulfate surfactant can be drying for very delicate scalps, but the added glycerin, betaine and polyquaternium-7 provide moisturizing and smoothing effects, making the shampoo generally suitable for normal to oily blonde hair while those with highly sensitive or extremely dry hair may prefer a sulfate-free alternative.

What is the role of Acid Violet 43 (CI 60730) in this shampoo?

Acid Violet 43 is a synthetic violet dye that deposits a subtle purple hue onto the hair fibers, counteracting yellow or brassy tones in blonde or highlighted hair and helping maintain a cooler, ash-blonde shade.

How often should No. 4P Blonde Enhancer Toning Shampoo be used, and does it contain any controversial chemicals?

For best toning results it is recommended to apply the shampoo 1-2 times per week, and the formula does contain fragrance, phenoxyethanol and the synthetic violet dye, ingredients that some consumers consider controversial or potentially irritating.

Olaplex • 250 ml

No. 4P Blonde Enhancer Toning Shampoo

Hair

Product Insights

No. 4P Blonde Enhancer Toning Shampoo is a violet-toning shampoo formulated for blonde or highlighted hair. It combines a sulfate surfactant base (Sodium C14-16 Olefin Sulfonate) with conditioning agents such as glycerin, betaine, and polyquaternium-7 to cleanse while providing moisture and detangling benefits. However, the inclusion of fragrance, phenoxyethanol, and the synthetic dye Acid Violet 43 may irritate sensitive scalps or cause allergic reactions.

Comparative Analysis

Positioned in the specialized niche of color-correcting shampoos for blondes, No. 4P Blonde Enhancer distinguishes itself by using the violet pigment Acid Violet 43 alongside a blend of surfactants and conditioning polymers to neutralize brassiness while delivering lightweight moisture, a feature not found in ordinary cleansing shampoos.

Ingredients

Water, Sodium C14-16 Olefin Sulfonate, Cocamidopropyl Betaine, Glycerin, Sodium Cocoamphoacetate, Sodium Chloride, Acrylates Copolymer, Betaine, Phenoxyethanol, Fragrance, Polyquaternium-7, Guar Hydroxypropyltrimonium Chloride, Ethylhexylglycerin, Bis-Aminopropyl Diglycol Dimaleate, Hexyl Cinnamal, Limonene, Citric Acid, Sodium Benzoate, Acid Violet 43 (CI 60730)

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