Professional hair coloration is not a static field. Every year, new formulations, new techniques, and new molecules reshape salon practice. Hairswiss examines the most significant market developments — not through the lens of aesthetic trends, but through that of the chemistry and technical protocols that make them possible.
The Chemistry of Coloration: A Review of the Basics
To grasp current developments, one must first understand the fundamental mechanisms. Permanent coloration is based on an oxidative coupling reaction: colorless precursors (oxidation bases such as para-phenylenediamine / PPD, and couplers) penetrate the cortex thanks to an alkaline medium (ammonia or equivalent), then react in the presence of hydrogen peroxide to form high molecular weight colored molecules, too large to exit the fiber. It is this molecular trapping that confers permanence.
Semi-permanent and direct coloration works differently: preformed pigments (colored ions) deposit on the cuticle surface or in the first cortex layers through adsorption and electrostatic or hydrophobic interactions, without irreversible chemical reaction — hence their limited duration.
The Major Current Technical Developments
1. Balayage and Fragmented Bleaching Techniques: Toward Greater Chemical Precision
Balayage is not new, but its practice has become considerably more sophisticated. New bleaching powder formulations integrate pH-controlled buffer systems that reduce excessive cuticle swelling — traditionally responsible for most post-bleaching damage. Some formulas also incorporate protease inhibitors, limiting the degradation of cortex proteins during processing time.
The major development lies in the emergence of disulfide bond agents (bond builders) — actives such as maleic acid, bis-aminopropyl diglycol dimaleate (popularized under the brand Olaplex®), or bis-vinylsulfonylmethyl acid (BVSM). These molecules position themselves along the keratin chain during bleaching to reform covalent bonds between cysteine residues, compensating in real time for the disulfide bond breakage induced by peroxide.
2. Ammonia-Free Colorations: Real Chemical Compromise or Marketing?
Ammonia (NH₃) has a precise role in permanent coloration: it alkalinizes the medium (pH 9-10), causing the cuticle to swell to allow precursor penetration, and activates the peroxide. “Ammonia-free” formulations substitute it with alkanolamines (monoethanolamine / MEA, amino-2-methyl-1-propanol / AMP) or low-volatility amines. These substitutes eliminate odor and reduce irritation, but their alkalizing power is less controllable than ammonia’s. Comparative studies show that ammonia-free colorations generally produce less uniform pigment penetration in the cortex, resulting in shorter-lasting color, particularly on thick or resistant hair.
3. High-Saturation Direct Pigments: Chemistry of Synthetic Dyes
The market for vibrant colors (pink, blue, violet, green) relies on synthetic direct dyes: essentially azo molecules, triarylmethanes, anthraquinones, and naphthenates. Their adsorption onto the fiber is governed by cuticle porosity — which is why pre-bleached hair (open cuticle, exposed cortex) absorbs these pigments incomparably more intensely. Duration correlates directly with the molecular weight of the pigment and the nature of its interactions with the keratin chains.
4. The Return of Henné and Plant-Based Dyes: Between Tradition and Technical Limits
Lawsone (2-hydroxy-1,4-naphthoquinone), the active compound of henné, colors keratin through a Michael reaction with the nucleophilic groups of amino acids. The bond formed is covalent, which explains wash resistance — but also the main problem: pure henné is incompatible with subsequent peroxide-based treatments, as fixed lawsone can react unpredictably during bleaching, with the risk of severe breakage.
5. The Integration of Treatments into Color Protocols
The most structurally significant development of recent years may not be chemical, but protocolar. The most advanced salons systematically integrate treatment steps before, during, and after every color service. If bleaching is a controlled degradation process, post-technical regeneration must be planned with the same rigor as the service itself. This logic is at the heart of what specialized platforms such as cliCHair.ch offer Swiss professionals: integrated protocols with the right actives for each step of the technical service. The Regeneration Therapy Mask by Edelstein, based on hydrolyzed keratin and aloe vera, illustrates this logic of structured post-technical regeneration.
What the Professional Must Remember
- The higher the pH and the longer the processing time, the greater the cuticle damage — regardless of the brand used.
- Bond builders do not repair an already-degraded cortex: they protect during the service. Post-technical regeneration remains indispensable.
- Chemical compatibility between different services (coloration, henné, straightening, perming) is not a detail — it is a matter of hair safety.
- Hair porosity must be assessed before every color service: it determines the formulation strategy and the risk of uneven results.
Hairswiss continuously monitors developments in professional coloration chemistry. Coming topics: bond-building systems in depth, and the chemistry of low-pH bleaching agents.