K18 Biomimetic Hairscience - TripleBright Oxidation Defense Purple Shampoo Foam
by K18 · hair_care
Editor's Take
K18 built a smarter purple shampoo than the usual violet wash, but the clean-beauty halo takes a hit from fragrance, Polysorbate 20, and quats.
Four-pillar formula scores
- Efficacy: 7.8 / 10
- Modern Tech: 8.0 / 10
- Clean Beauty: 3.3 / 10
- Sustainability: 7.4 / 10
The Verdict
This is one of the better-built purple shampoos for blond, gray, or highlighted hair because it tackles brassiness from two sides: violet pigment plus mineral-trapping chelators. The amino-acid cleanser base should feel gentler than a harsh sulfate wash, and Polyquaternium-77 helps the tone land instead of rinsing straight down the drain. The trade-off is the clean story: fragrance, listed allergens, Polysorbate 20, phenoxyethanol, and a quat make it far from a purist formula. Worth it when brassiness is driven by hard water and dull buildup, not the bottle I’d hand to a reactive scalp.
Full INCI list
Water(Aqua)(Eau), Cocamidopropyl Hydroxysultaine, Sodium Cocoyl Alaninate, Sodium Methyl Cocoyl Taurate, Propanediol, Polysorbate 20, Cocamidopropyl Betaine, Trisodium Dicarboxymethyl Alaninate, Sodium Phytate, Polyquaternium-77, Glycerin, Sodium Polyaspartate, Sodium Citrate, Sodium Gluconate, Citric Acid, Tetrasodium Glutamate Diacetate, Aspartic Acid, Caprylyl Glycol, Cocamidopropyl Dimethylamine, Sodium Glycolate, Sodium Hydroxide, Sodium Benzoate, Sodium Chloride, Acid Violet 43 (CI 60730), Phenoxyethanol, Fragrance (Parfum), Hexyl Cinnamal, Hydroxycitronellal, Citrus Limon (Lemon) Peel Oil, Tetramethyl Acetyloctahydronaphthalenes, Limonene, Benzyl Salicylate, Citrus Aurantium Peel Oil, Citrus Aurantium Flower Oil.